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 int smp_threads_ready=0;
40 volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,};
41 unsigned char boot_cpu_id = 0;
42 unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */
43 int smp_activated = 0;
44 volatile int __cpu_number_map[NR_CPUS];
45 volatile int __cpu_logical_map[NR_CPUS];
46 cycles_t cacheflush_time = 0; /* XXX */
47 unsigned long cache_decay_ticks = 100;
48
49 cpumask_t cpu_online_map = CPU_MASK_NONE;
50 cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
51
52 /* The only guaranteed locking primitive available on all Sparc
53 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
54 * places the current byte at the effective address into dest_reg and
55 * places 0xff there afterwards. Pretty lame locking primitive
56 * compared to the Alpha and the Intel no? Most Sparcs have 'swap'
57 * instruction which is much better...
58 */
59
60 /* Used to make bitops atomic */
61 unsigned char bitops_spinlock = 0;
62
63 volatile unsigned long ipi_count;
64
65 volatile int smp_process_available=0;
66 volatile int smp_commenced = 0;
67
68 void __init smp_store_cpu_info(int id)
69 {
70 int cpu_node;
71
72 cpu_data(id).udelay_val = loops_per_jiffy;
73
74 cpu_find_by_mid(id, &cpu_node);
75 cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
76 "clock-frequency", 0);
77 cpu_data(id).prom_node = cpu_node;
78 cpu_data(id).mid = cpu_get_hwmid(cpu_node);
79 if (cpu_data(id).mid < 0)
80 panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
81 }
82
83 void __init smp_cpus_done(unsigned int max_cpus)
84 {
85 }
86
87 void cpu_panic(void)
88 {
89 printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
90 panic("SMP bolixed\n");
91 }
92
93 struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
94
95 void __init smp_boot_cpus(void)
96 {
97 extern void smp4m_boot_cpus(void);
98 extern void smp4d_boot_cpus(void);
99
100 if (sparc_cpu_model == sun4m)
101 smp4m_boot_cpus();
102 else
103 smp4d_boot_cpus();
104 }
105
106 void smp_send_reschedule(int cpu)
107 {
108 /* See sparc64 */
109 }
110
111 void smp_send_stop(void)
112 {
113 }
114
115 void smp_flush_cache_all(void)
116 {
117 xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all));
118 local_flush_cache_all();
119 }
120
121 void smp_flush_tlb_all(void)
122 {
123 xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all));
124 local_flush_tlb_all();
125 }
126
127 void smp_flush_cache_mm(struct mm_struct *mm)
128 {
129 if(mm->context != NO_CONTEXT) {
130 cpumask_t cpu_mask = mm->cpu_vm_mask;
131 cpu_clear(smp_processor_id(), cpu_mask);
132 if (!cpus_empty(cpu_mask))
133 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm);
134 local_flush_cache_mm(mm);
135 }
136 }
137
138 void smp_flush_tlb_mm(struct mm_struct *mm)
139 {
140 if(mm->context != NO_CONTEXT) {
141 cpumask_t cpu_mask = mm->cpu_vm_mask;
142 cpu_clear(smp_processor_id(), cpu_mask);
143 if (!cpus_empty(cpu_mask)) {
144 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm);
145 if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm)
146 mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id());
147 }
148 local_flush_tlb_mm(mm);
149 }
150 }
151
152 void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start,
153 unsigned long end)
154 {
155 struct mm_struct *mm = vma->vm_mm;
156
157 if (mm->context != NO_CONTEXT) {
158 cpumask_t cpu_mask = mm->cpu_vm_mask;
159 cpu_clear(smp_processor_id(), cpu_mask);
160 if (!cpus_empty(cpu_mask))
161 xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end);
162 local_flush_cache_range(vma, start, end);
163 }
164 }
165
166 void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
167 unsigned long end)
168 {
169 struct mm_struct *mm = vma->vm_mm;
170
171 if (mm->context != NO_CONTEXT) {
172 cpumask_t cpu_mask = mm->cpu_vm_mask;
173 cpu_clear(smp_processor_id(), cpu_mask);
174 if (!cpus_empty(cpu_mask))
175 xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end);
176 local_flush_tlb_range(vma, start, end);
177 }
178 }
179
180 void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
181 {
182 struct mm_struct *mm = vma->vm_mm;
183
184 if(mm->context != NO_CONTEXT) {
185 cpumask_t cpu_mask = mm->cpu_vm_mask;
186 cpu_clear(smp_processor_id(), cpu_mask);
187 if (!cpus_empty(cpu_mask))
188 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page);
189 local_flush_cache_page(vma, page);
190 }
191 }
192
193 void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
194 {
195 struct mm_struct *mm = vma->vm_mm;
196
197 if(mm->context != NO_CONTEXT) {
198 cpumask_t cpu_mask = mm->cpu_vm_mask;
199 cpu_clear(smp_processor_id(), cpu_mask);
200 if (!cpus_empty(cpu_mask))
201 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page);
202 local_flush_tlb_page(vma, page);
203 }
204 }
205
206 void smp_reschedule_irq(void)
207 {
208 set_need_resched();
209 }
210
211 void smp_flush_page_to_ram(unsigned long page)
212 {
213 /* Current theory is that those who call this are the one's
214 * who have just dirtied their cache with the pages contents
215 * in kernel space, therefore we only run this on local cpu.
216 *
217 * XXX This experiment failed, research further... -DaveM
218 */
219 #if 1
220 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page);
221 #endif
222 local_flush_page_to_ram(page);
223 }
224
225 void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
226 {
227 cpumask_t cpu_mask = mm->cpu_vm_mask;
228 cpu_clear(smp_processor_id(), cpu_mask);
229 if (!cpus_empty(cpu_mask))
230 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr);
231 local_flush_sig_insns(mm, insn_addr);
232 }
233
234 extern unsigned int lvl14_resolution;
235
236 /* /proc/profile writes can call this, don't __init it please. */
237 static DEFINE_SPINLOCK(prof_setup_lock);
238
239 int setup_profiling_timer(unsigned int multiplier)
240 {
241 int i;
242 unsigned long flags;
243
244 /* Prevent level14 ticker IRQ flooding. */
245 if((!multiplier) || (lvl14_resolution / multiplier) < 500)
246 return -EINVAL;
247
248 spin_lock_irqsave(&prof_setup_lock, flags);
249 for(i = 0; i < NR_CPUS; i++) {
250 if (cpu_possible(i))
251 load_profile_irq(i, lvl14_resolution / multiplier);
252 prof_multiplier(i) = multiplier;
253 }
254 spin_unlock_irqrestore(&prof_setup_lock, flags);
255
256 return 0;
257 }
258
259 void __init smp_prepare_cpus(unsigned int maxcpus)
260 {
261 }
262
263 void __devinit smp_prepare_boot_cpu(void)
264 {
265 current_thread_info()->cpu = hard_smp_processor_id();
266 cpu_set(smp_processor_id(), cpu_online_map);
267 cpu_set(smp_processor_id(), phys_cpu_present_map);
268 }
269
270 int __devinit __cpu_up(unsigned int cpu)
271 {
272 panic("smp doesn't work\n");
273 }
274
275 void smp_bogo(struct seq_file *m)
276 {
277 int i;
278
279 for (i = 0; i < NR_CPUS; i++) {
280 if (cpu_online(i))
281 seq_printf(m,
282 "Cpu%dBogo\t: %lu.%02lu\n",
283 i,
284 cpu_data(i).udelay_val/(500000/HZ),
285 (cpu_data(i).udelay_val/(5000/HZ))%100);
286 }
287 }
288
289 void smp_info(struct seq_file *m)
290 {
291 int i;
292
293 seq_printf(m, "State:\n");
294 for (i = 0; i < NR_CPUS; i++) {
295 if (cpu_online(i))
296 seq_printf(m, "CPU%d\t\t: online\n", i);
297 }
298 }
299
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