arch/ia64: remove references to cpu_*_map
[~shefty/rdma-dev.git] / arch / ia64 / kernel / smp.c
1 /*
2  * SMP Support
3  *
4  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
5  * Copyright (C) 1999, 2001, 2003 David Mosberger-Tang <davidm@hpl.hp.com>
6  *
7  * Lots of stuff stolen from arch/alpha/kernel/smp.c
8  *
9  * 01/05/16 Rohit Seth <rohit.seth@intel.com>  IA64-SMP functions. Reorganized
10  * the existing code (on the lines of x86 port).
11  * 00/09/11 David Mosberger <davidm@hpl.hp.com> Do loops_per_jiffy
12  * calibration on each CPU.
13  * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> fixed logical processor id
14  * 00/03/31 Rohit Seth <rohit.seth@intel.com>   Fixes for Bootstrap Processor
15  * & cpu_online_map now gets done here (instead of setup.c)
16  * 99/10/05 davidm      Update to bring it in sync with new command-line processing
17  *  scheme.
18  * 10/13/00 Goutham Rao <goutham.rao@intel.com> Updated smp_call_function and
19  *              smp_call_function_single to resend IPI on timeouts
20  */
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/sched.h>
24 #include <linux/init.h>
25 #include <linux/interrupt.h>
26 #include <linux/smp.h>
27 #include <linux/kernel_stat.h>
28 #include <linux/mm.h>
29 #include <linux/cache.h>
30 #include <linux/delay.h>
31 #include <linux/efi.h>
32 #include <linux/bitops.h>
33 #include <linux/kexec.h>
34
35 #include <linux/atomic.h>
36 #include <asm/current.h>
37 #include <asm/delay.h>
38 #include <asm/machvec.h>
39 #include <asm/io.h>
40 #include <asm/irq.h>
41 #include <asm/page.h>
42 #include <asm/pgalloc.h>
43 #include <asm/pgtable.h>
44 #include <asm/processor.h>
45 #include <asm/ptrace.h>
46 #include <asm/sal.h>
47 #include <asm/system.h>
48 #include <asm/tlbflush.h>
49 #include <asm/unistd.h>
50 #include <asm/mca.h>
51
52 /*
53  * Note: alignment of 4 entries/cacheline was empirically determined
54  * to be a good tradeoff between hot cachelines & spreading the array
55  * across too many cacheline.
56  */
57 static struct local_tlb_flush_counts {
58         unsigned int count;
59 } __attribute__((__aligned__(32))) local_tlb_flush_counts[NR_CPUS];
60
61 static DEFINE_PER_CPU_SHARED_ALIGNED(unsigned short [NR_CPUS],
62                                      shadow_flush_counts);
63
64 #define IPI_CALL_FUNC           0
65 #define IPI_CPU_STOP            1
66 #define IPI_CALL_FUNC_SINGLE    2
67 #define IPI_KDUMP_CPU_STOP      3
68
69 /* This needs to be cacheline aligned because it is written to by *other* CPUs.  */
70 static DEFINE_PER_CPU_SHARED_ALIGNED(unsigned long, ipi_operation);
71
72 extern void cpu_halt (void);
73
74 static void
75 stop_this_cpu(void)
76 {
77         /*
78          * Remove this CPU:
79          */
80         set_cpu_online(smp_processor_id(), false);
81         max_xtp();
82         local_irq_disable();
83         cpu_halt();
84 }
85
86 void
87 cpu_die(void)
88 {
89         max_xtp();
90         local_irq_disable();
91         cpu_halt();
92         /* Should never be here */
93         BUG();
94         for (;;);
95 }
96
97 irqreturn_t
98 handle_IPI (int irq, void *dev_id)
99 {
100         int this_cpu = get_cpu();
101         unsigned long *pending_ipis = &__ia64_per_cpu_var(ipi_operation);
102         unsigned long ops;
103
104         mb();   /* Order interrupt and bit testing. */
105         while ((ops = xchg(pending_ipis, 0)) != 0) {
106                 mb();   /* Order bit clearing and data access. */
107                 do {
108                         unsigned long which;
109
110                         which = ffz(~ops);
111                         ops &= ~(1 << which);
112
113                         switch (which) {
114                         case IPI_CPU_STOP:
115                                 stop_this_cpu();
116                                 break;
117                         case IPI_CALL_FUNC:
118                                 generic_smp_call_function_interrupt();
119                                 break;
120                         case IPI_CALL_FUNC_SINGLE:
121                                 generic_smp_call_function_single_interrupt();
122                                 break;
123 #ifdef CONFIG_KEXEC
124                         case IPI_KDUMP_CPU_STOP:
125                                 unw_init_running(kdump_cpu_freeze, NULL);
126                                 break;
127 #endif
128                         default:
129                                 printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n",
130                                                 this_cpu, which);
131                                 break;
132                         }
133                 } while (ops);
134                 mb();   /* Order data access and bit testing. */
135         }
136         put_cpu();
137         return IRQ_HANDLED;
138 }
139
140
141
142 /*
143  * Called with preemption disabled.
144  */
145 static inline void
146 send_IPI_single (int dest_cpu, int op)
147 {
148         set_bit(op, &per_cpu(ipi_operation, dest_cpu));
149         platform_send_ipi(dest_cpu, IA64_IPI_VECTOR, IA64_IPI_DM_INT, 0);
150 }
151
152 /*
153  * Called with preemption disabled.
154  */
155 static inline void
156 send_IPI_allbutself (int op)
157 {
158         unsigned int i;
159
160         for_each_online_cpu(i) {
161                 if (i != smp_processor_id())
162                         send_IPI_single(i, op);
163         }
164 }
165
166 /*
167  * Called with preemption disabled.
168  */
169 static inline void
170 send_IPI_mask(const struct cpumask *mask, int op)
171 {
172         unsigned int cpu;
173
174         for_each_cpu(cpu, mask) {
175                         send_IPI_single(cpu, op);
176         }
177 }
178
179 /*
180  * Called with preemption disabled.
181  */
182 static inline void
183 send_IPI_all (int op)
184 {
185         int i;
186
187         for_each_online_cpu(i) {
188                 send_IPI_single(i, op);
189         }
190 }
191
192 /*
193  * Called with preemption disabled.
194  */
195 static inline void
196 send_IPI_self (int op)
197 {
198         send_IPI_single(smp_processor_id(), op);
199 }
200
201 #ifdef CONFIG_KEXEC
202 void
203 kdump_smp_send_stop(void)
204 {
205         send_IPI_allbutself(IPI_KDUMP_CPU_STOP);
206 }
207
208 void
209 kdump_smp_send_init(void)
210 {
211         unsigned int cpu, self_cpu;
212         self_cpu = smp_processor_id();
213         for_each_online_cpu(cpu) {
214                 if (cpu != self_cpu) {
215                         if(kdump_status[cpu] == 0)
216                                 platform_send_ipi(cpu, 0, IA64_IPI_DM_INIT, 0);
217                 }
218         }
219 }
220 #endif
221 /*
222  * Called with preemption disabled.
223  */
224 void
225 smp_send_reschedule (int cpu)
226 {
227         platform_send_ipi(cpu, IA64_IPI_RESCHEDULE, IA64_IPI_DM_INT, 0);
228 }
229 EXPORT_SYMBOL_GPL(smp_send_reschedule);
230
231 /*
232  * Called with preemption disabled.
233  */
234 static void
235 smp_send_local_flush_tlb (int cpu)
236 {
237         platform_send_ipi(cpu, IA64_IPI_LOCAL_TLB_FLUSH, IA64_IPI_DM_INT, 0);
238 }
239
240 void
241 smp_local_flush_tlb(void)
242 {
243         /*
244          * Use atomic ops. Otherwise, the load/increment/store sequence from
245          * a "++" operation can have the line stolen between the load & store.
246          * The overhead of the atomic op in negligible in this case & offers
247          * significant benefit for the brief periods where lots of cpus
248          * are simultaneously flushing TLBs.
249          */
250         ia64_fetchadd(1, &local_tlb_flush_counts[smp_processor_id()].count, acq);
251         local_flush_tlb_all();
252 }
253
254 #define FLUSH_DELAY     5 /* Usec backoff to eliminate excessive cacheline bouncing */
255
256 void
257 smp_flush_tlb_cpumask(cpumask_t xcpumask)
258 {
259         unsigned short *counts = __ia64_per_cpu_var(shadow_flush_counts);
260         cpumask_t cpumask = xcpumask;
261         int mycpu, cpu, flush_mycpu = 0;
262
263         preempt_disable();
264         mycpu = smp_processor_id();
265
266         for_each_cpu_mask(cpu, cpumask)
267                 counts[cpu] = local_tlb_flush_counts[cpu].count & 0xffff;
268
269         mb();
270         for_each_cpu_mask(cpu, cpumask) {
271                 if (cpu == mycpu)
272                         flush_mycpu = 1;
273                 else
274                         smp_send_local_flush_tlb(cpu);
275         }
276
277         if (flush_mycpu)
278                 smp_local_flush_tlb();
279
280         for_each_cpu_mask(cpu, cpumask)
281                 while(counts[cpu] == (local_tlb_flush_counts[cpu].count & 0xffff))
282                         udelay(FLUSH_DELAY);
283
284         preempt_enable();
285 }
286
287 void
288 smp_flush_tlb_all (void)
289 {
290         on_each_cpu((void (*)(void *))local_flush_tlb_all, NULL, 1);
291 }
292
293 void
294 smp_flush_tlb_mm (struct mm_struct *mm)
295 {
296         cpumask_var_t cpus;
297         preempt_disable();
298         /* this happens for the common case of a single-threaded fork():  */
299         if (likely(mm == current->active_mm && atomic_read(&mm->mm_users) == 1))
300         {
301                 local_finish_flush_tlb_mm(mm);
302                 preempt_enable();
303                 return;
304         }
305         if (!alloc_cpumask_var(&cpus, GFP_ATOMIC)) {
306                 smp_call_function((void (*)(void *))local_finish_flush_tlb_mm,
307                         mm, 1);
308         } else {
309                 cpumask_copy(cpus, mm_cpumask(mm));
310                 smp_call_function_many(cpus,
311                         (void (*)(void *))local_finish_flush_tlb_mm, mm, 1);
312                 free_cpumask_var(cpus);
313         }
314         local_irq_disable();
315         local_finish_flush_tlb_mm(mm);
316         local_irq_enable();
317         preempt_enable();
318 }
319
320 void arch_send_call_function_single_ipi(int cpu)
321 {
322         send_IPI_single(cpu, IPI_CALL_FUNC_SINGLE);
323 }
324
325 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
326 {
327         send_IPI_mask(mask, IPI_CALL_FUNC);
328 }
329
330 /*
331  * this function calls the 'stop' function on all other CPUs in the system.
332  */
333 void
334 smp_send_stop (void)
335 {
336         send_IPI_allbutself(IPI_CPU_STOP);
337 }
338
339 int
340 setup_profiling_timer (unsigned int multiplier)
341 {
342         return -EINVAL;
343 }