patch-2.3.99-pre9 linux/arch/mips64/kernel/smp.c

• Lines: 259
• Date: Sat May 13 08:30:17 2000
• Orig file: v2.3.99-pre8/linux/arch/mips64/kernel/smp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre8/linux/arch/mips64/kernel/smp.c linux/arch/mips64/kernel/smp.c
@@ -0,0 +1,258 @@
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/threads.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/sched.h>
+
+#include <asm/atomic.h>
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/hardirq.h>
+#include <asm/softirq.h>
+#include <asm/mmu_context.h>
+
+#ifdef CONFIG_SGI_IP27
+
+#include <asm/sn/arch.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/agent.h>
+#include <asm/sn/sn0/ip27.h>
+
+#define DORESCHED	0xab
+#define DOCALL		0xbc
+
+#define IRQ_TO_SWLEVEL(i)	i + 7	/* Delete this from here */
+
+static void sendintr(int destid, unsigned char status)
+{
+	int irq;
+
+#if (CPUS_PER_NODE == 2)
+	switch (status) {
+		case DORESCHED:	irq = CPU_RESCHED_A_IRQ; break;
+		case DOCALL:	irq = CPU_CALL_A_IRQ; break;
+		default:	panic("sendintr");
+	}
+	irq += cputoslice(destid);
+
+	/*
+	 * Convert the compact hub number to the NASID to get the correct
+	 * part of the address space.  Then set the interrupt bit associated
+	 * with the CPU we want to send the interrupt to.
+	 */
+	REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cputocnode(destid)),
+			IRQ_TO_SWLEVEL(irq));
+#else
+	<< Bomb!  Must redefine this for more than 2 CPUS. >>
+#endif
+}
+
+#endif /* CONFIG_SGI_IP27 */
+
+/* The 'big kernel lock' */
+spinlock_t kernel_flag = SPIN_LOCK_UNLOCKED;
+int smp_threads_ready = 0;	/* Not used */
+atomic_t smp_commenced = ATOMIC_INIT(0);
+struct cpuinfo_mips cpu_data[NR_CPUS];
+int smp_num_cpus;		/* Number that came online.  */
+int __cpu_number_map[NR_CPUS];
+int __cpu_logical_map[NR_CPUS];
+cycles_t cacheflush_time;
+
+static void smp_tune_scheduling (void)
+{
+}
+
+void __init smp_boot_cpus(void)
+{
+	extern void allowboot(void);
+	extern int maxcpus;
+
+	init_new_context(current, &init_mm);
+	global_irq_holder = 0;
+	current->processor = 0;
+	init_idle();
+	smp_tune_scheduling();
+	smp_num_cpus = maxcpus;
+	allowboot();
+}
+
+void __init smp_commence(void)
+{
+	wmb();
+	atomic_set(&smp_commenced,1);
+}
+
+static void stop_this_cpu(void *dummy)
+{
+	/*
+	 * Remove this CPU
+	 */
+	for (;;);
+}
+
+void smp_send_stop(void)
+{
+	smp_call_function(stop_this_cpu, NULL, 1, 0);
+	smp_num_cpus = 1;
+}
+
+/*
+ * this function sends a 'reschedule' IPI to another CPU.
+ * it goes straight through and wastes no time serializing
+ * anything. Worst case is that we lose a reschedule ...
+ */
+void smp_send_reschedule(int cpu)
+{
+	sendintr(cpu, DORESCHED);
+}
+
+/* Not really SMP stuff ... */
+int setup_profiling_timer(unsigned int multiplier)
+{
+	return 0;
+}
+
+/*
+ * Run a function on all other CPUs.
+ *  <func>      The function to run. This must be fast and non-blocking.
+ *  <info>      An arbitrary pointer to pass to the function.
+ *  <retry>     If true, keep retrying until ready.
+ *  <wait>      If true, wait until function has completed on other CPUs.
+ *  [RETURNS]   0 on success, else a negative status code.
+ *
+ * Does not return until remote CPUs are nearly ready to execute <func>
+ * or are or have executed.
+ */
+static volatile struct call_data_struct {
+	void (*func) (void *info);
+	void *info;
+	atomic_t started;
+	atomic_t finished;
+	int wait;
+} *call_data = NULL;
+
+int smp_call_function (void (*func) (void *info), void *info, int retry, 
+								int wait)
+{
+	struct call_data_struct data;
+	int i, cpus = smp_num_cpus-1;
+	static spinlock_t lock = SPIN_LOCK_UNLOCKED;
+
+	if (cpus == 0)
+		return 0;
+
+	data.func = func;
+	data.info = info;
+	atomic_set(&data.started, 0);
+	data.wait = wait;
+	if (wait)
+		atomic_set(&data.finished, 0);
+
+	spin_lock_bh(&lock);
+	call_data = &data;
+	/* Send a message to all other CPUs and wait for them to respond */
+	for (i = 0; i < smp_num_cpus; i++)
+		if (smp_processor_id() != i)
+			sendintr(i, DOCALL);
+
+	/* Wait for response */
+	/* FIXME: lock-up detection, backtrace on lock-up */
+	while (atomic_read(&data.started) != cpus)
+		barrier();
+
+	if (wait)
+		while (atomic_read(&data.finished) != cpus)
+			barrier();
+	spin_unlock_bh(&lock);
+	return 0;
+}
+
+void smp_call_function_interrupt(void)
+{
+	void (*func) (void *info) = call_data->func;
+	void *info = call_data->info;
+	int wait = call_data->wait;
+
+	/*
+	 * Notify initiating CPU that I've grabbed the data and am
+	 * about to execute the function.
+	 */
+	atomic_inc(&call_data->started);
+
+	/*
+	 * At this point the info structure may be out of scope unless wait==1.
+	 */
+	(*func)(info);
+	if (wait)
+		atomic_inc(&call_data->finished);
+}
+	
+
+static void flush_tlb_all_ipi(void *info)
+{
+	_flush_tlb_all();
+}
+
+void flush_tlb_all(void)
+{
+	smp_call_function(flush_tlb_all_ipi, 0, 1, 1);
+	_flush_tlb_all();
+}
+
+static void flush_tlb_mm_ipi(void *mm)
+{
+	_flush_tlb_mm((struct mm_struct *)mm);
+}
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+	smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1, 1);
+	_flush_tlb_mm(mm);
+}
+
+struct flush_tlb_data {
+	struct mm_struct *mm;
+	struct vm_area_struct *vma;
+	unsigned long addr1;
+	unsigned long addr2;
+};
+
+static void flush_tlb_range_ipi(void *info)
+{
+	struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
+
+	_flush_tlb_range(fd->mm, fd->addr1, fd->addr2);
+}
+
+void flush_tlb_range(struct mm_struct *mm, unsigned long start, unsigned long end)
+{
+	struct flush_tlb_data fd;
+
+	fd.mm = mm;
+	fd.addr1 = start;
+	fd.addr2 = end;
+	smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1, 1);
+	_flush_tlb_range(mm, start, end);
+}
+
+static void flush_tlb_page_ipi(void *info)
+{
+	struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
+
+	_flush_tlb_page(fd->vma, fd->addr1);
+}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
+{
+	struct flush_tlb_data fd;
+
+	fd.vma = vma;
+	fd.addr1 = page;
+	smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1, 1);
+	_flush_tlb_page(vma, page);
+}
+