[SPARC]: Try to start getting SMP back into shape.

Todo items:
 - IRQ_INPROGRESS flag - use sparc64 irq buckets, or generic irq_desc?
 - sun4d
 - re-indent large chunks of sun4m_smp.c
 - some places assume sequential cpu numbering (i.e. 0,1 instead of 0,2)

Last I checked (with 2.6.14), random programs segfault with dual
HyperSPARC.  And with SuperSPARC II's, it seems stable but will
eventually die from a write lock error (wrong lock owner or something).

I haven't tried the HyperSPARC + highmem combination recently, so that
may still be a problem.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 63 insertions, 21 deletions

diff --git a/arch/sparc/kernel/smp.c b/arch/sparc/kernel/smp.c
index ea5682ce7031..2be812115197 100644
--- a/arch/sparc/kernel/smp.c
+++ b/arch/sparc/kernel/smp.c
@@ -45,6 +45,7 @@ volatile int __cpu_logical_map[NR_CPUS];
 
 cpumask_t cpu_online_map = CPU_MASK_NONE;
 cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
+cpumask_t smp_commenced_mask = CPU_MASK_NONE;
 
 /* The only guaranteed locking primitive available on all Sparc
  * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
@@ -57,11 +58,6 @@ cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
 /* Used to make bitops atomic */
 unsigned char bitops_spinlock = 0;
 
-volatile unsigned long ipi_count;
-
-volatile int smp_process_available=0;
-volatile int smp_commenced = 0;
-
 void __init smp_store_cpu_info(int id)
 {
         int cpu_node;
@@ -79,6 +75,22 @@ void __init smp_store_cpu_info(int id)
 
 void __init smp_cpus_done(unsigned int max_cpus)
 {
+        extern void smp4m_smp_done(void);
+        unsigned long bogosum = 0;
+        int cpu, num;
+
+        for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++)
+                if (cpu_online(cpu)) {
+                        num++;
+                        bogosum += cpu_data(cpu).udelay_val;
+                }
+
+        printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
+                num, bogosum/(500000/HZ),
+                (bogosum/(5000/HZ))%100);
+
+        BUG_ON(sparc_cpu_model != sun4m);
+        smp4m_smp_done();
 }
 
 void cpu_panic(void)
@@ -89,17 +101,6 @@ void cpu_panic(void)
 
 struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
 
-void __init smp_boot_cpus(void)
-{
-        extern void smp4m_boot_cpus(void);
-        extern void smp4d_boot_cpus(void);
-        
-        if (sparc_cpu_model == sun4m)
-                smp4m_boot_cpus();
-        else
-                smp4d_boot_cpus();
-}
-
 void smp_send_reschedule(int cpu)
 {
         /* See sparc64 */
@@ -252,20 +253,61 @@ int setup_profiling_timer(unsigned int multiplier)
         return 0;
 }
 
-void __init smp_prepare_cpus(unsigned int maxcpus)
+void __init smp_prepare_cpus(unsigned int max_cpus)
 {
+        extern void smp4m_boot_cpus(void);
+        int i, cpuid, ncpus, extra;
+
+        BUG_ON(sparc_cpu_model != sun4m);
+        printk("Entering SMP Mode...\n");
+
+        ncpus = 1;
+        extra = 0;
+        for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
+                if (cpuid == boot_cpu_id)
+                        continue;
+                if (cpuid < NR_CPUS && ncpus++ < max_cpus)
+                        cpu_set(cpuid, phys_cpu_present_map);
+                else
+                        extra++;
+        }
+        if (max_cpus >= NR_CPUS && extra)
+                printk("Warning: NR_CPUS is too low to start all cpus\n");
+
+        smp_store_cpu_info(boot_cpu_id);
+
+        smp4m_boot_cpus();
 }
 
 void __devinit smp_prepare_boot_cpu(void)
 {
-        current_thread_info()->cpu = hard_smp_processor_id();
-        cpu_set(smp_processor_id(), cpu_online_map);
-        cpu_set(smp_processor_id(), phys_cpu_present_map);
+        int cpuid = hard_smp_processor_id();
+
+        if (cpuid >= NR_CPUS) {
+                prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
+                prom_halt();
+        }
+        if (cpuid != 0)
+                printk("boot cpu id != 0, this could work but is untested\n");
+
+        current_thread_info()->cpu = cpuid;
+        cpu_set(cpuid, cpu_online_map);
+        cpu_set(cpuid, phys_cpu_present_map);
 }
 
 int __devinit __cpu_up(unsigned int cpu)
 {
-        panic("smp doesn't work\n");
+        extern int smp4m_boot_one_cpu(int);
+        int ret;
+
+        ret = smp4m_boot_one_cpu(cpu);
+
+        if (!ret) {
+                cpu_set(cpu, smp_commenced_mask);
+                while (!cpu_online(cpu))
+                        mb();
+        }
+        return ret;
 }
 
 void smp_bogo(struct seq_file *m)