arch/sparc/kernel/smp.c

   1 /* smp.c: Sparc SMP support.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   4  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
   6  */
   7
   8 #include <asm/head.h>
   9
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/threads.h>
  13 #include <linux/smp.h>
  14 #include <linux/smp_lock.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/init.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/mm.h>
  20 #include <linux/fs.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/cache.h>
  23 #include <linux/delay.h>
  24
  25 #include <asm/ptrace.h>
  26 #include <asm/atomic.h>
  27
  28 #include <asm/irq.h>
  29 #include <asm/page.h>
  30 #include <asm/pgalloc.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/oplib.h>
  33 #include <asm/cacheflush.h>
  34 #include <asm/tlbflush.h>
  35 #include <asm/cpudata.h>
  36
  37 volatile int smp_processors_ready = 0;
  38 int smp_num_cpus = 1;
  39 volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,};
  40 unsigned char boot_cpu_id = 0;
  41 unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */
  42 int smp_activated = 0;
  43 volatile int __cpu_number_map[NR_CPUS];
  44 volatile int __cpu_logical_map[NR_CPUS];
  45
  46 cpumask_t cpu_online_map = CPU_MASK_NONE;
  47 cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
  48
  49 /* The only guaranteed locking primitive available on all Sparc
  50  * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
  51  * places the current byte at the effective address into dest_reg and
  52  * places 0xff there afterwards.  Pretty lame locking primitive
  53  * compared to the Alpha and the Intel no?  Most Sparcs have 'swap'
  54  * instruction which is much better...
  55  */
  56
  57 /* Used to make bitops atomic */
  58 unsigned char bitops_spinlock = 0;
  59
  60 volatile unsigned long ipi_count;
  61
  62 volatile int smp_process_available=0;
  63 volatile int smp_commenced = 0;
  64
  65 void __init smp_store_cpu_info(int id)
  66 {
  67         int cpu_node;
  68
  69         cpu_data(id).udelay_val = loops_per_jiffy;
  70
  71         cpu_find_by_mid(id, &cpu_node);
  72         cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
  73                                                      "clock-frequency", 0);
  74         cpu_data(id).prom_node = cpu_node;
  75         cpu_data(id).mid = cpu_get_hwmid(cpu_node);
  76         if (cpu_data(id).mid < 0)
  77                 panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
  78 }
  79
  80 void __init smp_cpus_done(unsigned int max_cpus)
  81 {
  82 }
  83
  84 void cpu_panic(void)
  85 {
  86         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
  87         panic("SMP bolixed\n");
  88 }
  89
  90 struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
  91
  92 void __init smp_boot_cpus(void)
  93 {
  94         extern void smp4m_boot_cpus(void);
  95         extern void smp4d_boot_cpus(void);
  96
  97         if (sparc_cpu_model == sun4m)
  98                 smp4m_boot_cpus();
  99         else
 100                 smp4d_boot_cpus();
 101 }
 102
 103 void smp_send_reschedule(int cpu)
 104 {
 105         /* See sparc64 */
 106 }
 107
 108 void smp_send_stop(void)
 109 {
 110 }
 111
 112 void smp_flush_cache_all(void)
 113 {
 114         xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all));
 115         local_flush_cache_all();
 116 }
 117
 118 void smp_flush_tlb_all(void)
 119 {
 120         xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all));
 121         local_flush_tlb_all();
 122 }
 123
 124 void smp_flush_cache_mm(struct mm_struct *mm)
 125 {
 126         if(mm->context != NO_CONTEXT) {
 127                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 128                 cpu_clear(smp_processor_id(), cpu_mask);
 129                 if (!cpus_empty(cpu_mask))
 130                         xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm);
 131                 local_flush_cache_mm(mm);
 132         }
 133 }
 134
 135 void smp_flush_tlb_mm(struct mm_struct *mm)
 136 {
 137         if(mm->context != NO_CONTEXT) {
 138                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 139                 cpu_clear(smp_processor_id(), cpu_mask);
 140                 if (!cpus_empty(cpu_mask)) {
 141                         xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm);
 142                         if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm)
 143                                 mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id());
 144                 }
 145                 local_flush_tlb_mm(mm);
 146         }
 147 }
 148
 149 void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start,
 150                            unsigned long end)
 151 {
 152         struct mm_struct *mm = vma->vm_mm;
 153
 154         if (mm->context != NO_CONTEXT) {
 155                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 156                 cpu_clear(smp_processor_id(), cpu_mask);
 157                 if (!cpus_empty(cpu_mask))
 158                         xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end);
 159                 local_flush_cache_range(vma, start, end);
 160         }
 161 }
 162
 163 void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 164                          unsigned long end)
 165 {
 166         struct mm_struct *mm = vma->vm_mm;
 167
 168         if (mm->context != NO_CONTEXT) {
 169                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 170                 cpu_clear(smp_processor_id(), cpu_mask);
 171                 if (!cpus_empty(cpu_mask))
 172                         xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end);
 173                 local_flush_tlb_range(vma, start, end);
 174         }
 175 }
 176
 177 void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
 178 {
 179         struct mm_struct *mm = vma->vm_mm;
 180
 181         if(mm->context != NO_CONTEXT) {
 182                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 183                 cpu_clear(smp_processor_id(), cpu_mask);
 184                 if (!cpus_empty(cpu_mask))
 185                         xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page);
 186                 local_flush_cache_page(vma, page);
 187         }
 188 }
 189
 190 void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 191 {
 192         struct mm_struct *mm = vma->vm_mm;
 193
 194         if(mm->context != NO_CONTEXT) {
 195                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 196                 cpu_clear(smp_processor_id(), cpu_mask);
 197                 if (!cpus_empty(cpu_mask))
 198                         xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page);
 199                 local_flush_tlb_page(vma, page);
 200         }
 201 }
 202
 203 void smp_reschedule_irq(void)
 204 {
 205         set_need_resched();
 206 }
 207
 208 void smp_flush_page_to_ram(unsigned long page)
 209 {
 210         /* Current theory is that those who call this are the one's
 211          * who have just dirtied their cache with the pages contents
 212          * in kernel space, therefore we only run this on local cpu.
 213          *
 214          * XXX This experiment failed, research further... -DaveM
 215          */
 216 #if 1
 217         xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page);
 218 #endif
 219         local_flush_page_to_ram(page);
 220 }
 221
 222 void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
 223 {
 224         cpumask_t cpu_mask = mm->cpu_vm_mask;
 225         cpu_clear(smp_processor_id(), cpu_mask);
 226         if (!cpus_empty(cpu_mask))
 227                 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr);
 228         local_flush_sig_insns(mm, insn_addr);
 229 }
 230
 231 extern unsigned int lvl14_resolution;
 232
 233 /* /proc/profile writes can call this, don't __init it please. */
 234 static DEFINE_SPINLOCK(prof_setup_lock);
 235
 236 int setup_profiling_timer(unsigned int multiplier)
 237 {
 238         int i;
 239         unsigned long flags;
 240
 241         /* Prevent level14 ticker IRQ flooding. */
 242         if((!multiplier) || (lvl14_resolution / multiplier) < 500)
 243                 return -EINVAL;
 244
 245         spin_lock_irqsave(&prof_setup_lock, flags);
 246         for(i = 0; i < NR_CPUS; i++) {
 247                 if (cpu_possible(i))
 248                         load_profile_irq(i, lvl14_resolution / multiplier);
 249                 prof_multiplier(i) = multiplier;
 250         }
 251         spin_unlock_irqrestore(&prof_setup_lock, flags);
 252
 253         return 0;
 254 }
 255
 256 void __init smp_prepare_cpus(unsigned int maxcpus)
 257 {
 258 }
 259
 260 void __devinit smp_prepare_boot_cpu(void)
 261 {
 262         current_thread_info()->cpu = hard_smp_processor_id();
 263         cpu_set(smp_processor_id(), cpu_online_map);
 264         cpu_set(smp_processor_id(), phys_cpu_present_map);
 265 }
 266
 267 int __devinit __cpu_up(unsigned int cpu)
 268 {
 269         panic("smp doesn't work\n");
 270 }
 271
 272 void smp_bogo(struct seq_file *m)
 273 {
 274         int i;
 275
 276         for (i = 0; i < NR_CPUS; i++) {
 277                 if (cpu_online(i))
 278                         seq_printf(m,
 279                                    "Cpu%dBogo\t: %lu.%02lu\n",
 280                                    i,
 281                                    cpu_data(i).udelay_val/(500000/HZ),
 282                                    (cpu_data(i).udelay_val/(5000/HZ))%100);
 283         }
 284 }
 285
 286 void smp_info(struct seq_file *m)
 287 {
 288         int i;
 289
 290         seq_printf(m, "State:\n");
 291         for (i = 0; i < NR_CPUS; i++) {
 292                 if (cpu_online(i))
 293                         seq_printf(m, "CPU%d\t\t: online\n", i);
 294         }
 295 }