2 * File: arch/blackfin/kernel/smp.c
3 * Author: Philippe Gerum <rpm@xenomai.org>
4 * IPI management based on arch/arm/kernel/smp.c.
6 * Copyright 2007 Analog Devices Inc.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see the file COPYING, or write
20 * to the Free Software Foundation, Inc.,
21 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 #include <linux/module.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/spinlock.h>
28 #include <linux/sched.h>
29 #include <linux/interrupt.h>
30 #include <linux/cache.h>
31 #include <linux/profile.h>
32 #include <linux/errno.h>
34 #include <linux/cpu.h>
35 #include <linux/smp.h>
36 #include <linux/seq_file.h>
37 #include <linux/irq.h>
38 #include <asm/atomic.h>
39 #include <asm/cacheflush.h>
40 #include <asm/mmu_context.h>
41 #include <asm/pgtable.h>
42 #include <asm/pgalloc.h>
43 #include <asm/processor.h>
44 #include <asm/ptrace.h>
46 #include <linux/err.h>
48 struct corelock_slot corelock
__attribute__ ((__section__(".l2.bss")));
50 void __cpuinitdata
*init_retx_coreb
, *init_saved_retx_coreb
,
51 *init_saved_seqstat_coreb
, *init_saved_icplb_fault_addr_coreb
,
52 *init_saved_dcplb_fault_addr_coreb
;
54 cpumask_t cpu_possible_map
;
55 EXPORT_SYMBOL(cpu_possible_map
);
57 cpumask_t cpu_online_map
;
58 EXPORT_SYMBOL(cpu_online_map
);
60 #define BFIN_IPI_RESCHEDULE 0
61 #define BFIN_IPI_CALL_FUNC 1
62 #define BFIN_IPI_CPU_STOP 2
64 struct blackfin_flush_data
{
69 void *secondary_stack
;
72 struct smp_call_struct
{
73 void (*func
)(void *info
);
80 static struct blackfin_flush_data smp_flush_data
;
82 static DEFINE_SPINLOCK(stop_lock
);
85 struct list_head list
;
87 struct smp_call_struct call_struct
;
90 struct ipi_message_queue
{
91 struct list_head head
;
96 static DEFINE_PER_CPU(struct ipi_message_queue
, ipi_msg_queue
);
98 static void ipi_cpu_stop(unsigned int cpu
)
100 spin_lock(&stop_lock
);
101 printk(KERN_CRIT
"CPU%u: stopping\n", cpu
);
103 spin_unlock(&stop_lock
);
105 cpu_clear(cpu
, cpu_online_map
);
113 static void ipi_flush_icache(void *info
)
115 struct blackfin_flush_data
*fdata
= info
;
117 /* Invalidate the memory holding the bounds of the flushed region. */
118 blackfin_dcache_invalidate_range((unsigned long)fdata
,
119 (unsigned long)fdata
+ sizeof(*fdata
));
121 blackfin_icache_flush_range(fdata
->start
, fdata
->end
);
124 static void ipi_call_function(unsigned int cpu
, struct ipi_message
*msg
)
127 void (*func
)(void *info
);
129 func
= msg
->call_struct
.func
;
130 info
= msg
->call_struct
.info
;
131 wait
= msg
->call_struct
.wait
;
132 cpu_clear(cpu
, msg
->call_struct
.pending
);
135 cpu_clear(cpu
, msg
->call_struct
.waitmask
);
140 static irqreturn_t
ipi_handler(int irq
, void *dev_instance
)
142 struct ipi_message
*msg
, *mg
;
143 struct ipi_message_queue
*msg_queue
;
144 unsigned int cpu
= smp_processor_id();
146 platform_clear_ipi(cpu
);
148 msg_queue
= &__get_cpu_var(ipi_msg_queue
);
151 spin_lock(&msg_queue
->lock
);
152 list_for_each_entry_safe(msg
, mg
, &msg_queue
->head
, list
) {
153 list_del(&msg
->list
);
155 case BFIN_IPI_RESCHEDULE
:
156 /* That's the easiest one; leave it to
157 * return_from_int. */
160 case BFIN_IPI_CALL_FUNC
:
161 ipi_call_function(cpu
, msg
);
163 case BFIN_IPI_CPU_STOP
:
168 printk(KERN_CRIT
"CPU%u: Unknown IPI message \
169 0x%lx\n", cpu
, msg
->type
);
174 spin_unlock(&msg_queue
->lock
);
178 static void ipi_queue_init(void)
181 struct ipi_message_queue
*msg_queue
;
182 for_each_possible_cpu(cpu
) {
183 msg_queue
= &per_cpu(ipi_msg_queue
, cpu
);
184 INIT_LIST_HEAD(&msg_queue
->head
);
185 spin_lock_init(&msg_queue
->lock
);
186 msg_queue
->count
= 0;
190 int smp_call_function(void (*func
)(void *info
), void *info
, int wait
)
195 struct ipi_message_queue
*msg_queue
;
196 struct ipi_message
*msg
;
198 callmap
= cpu_online_map
;
199 cpu_clear(smp_processor_id(), callmap
);
200 if (cpus_empty(callmap
))
203 msg
= kmalloc(sizeof(*msg
), GFP_ATOMIC
);
204 INIT_LIST_HEAD(&msg
->list
);
205 msg
->call_struct
.func
= func
;
206 msg
->call_struct
.info
= info
;
207 msg
->call_struct
.wait
= wait
;
208 msg
->call_struct
.pending
= callmap
;
209 msg
->call_struct
.waitmask
= callmap
;
210 msg
->type
= BFIN_IPI_CALL_FUNC
;
212 for_each_cpu_mask(cpu
, callmap
) {
213 msg_queue
= &per_cpu(ipi_msg_queue
, cpu
);
214 spin_lock_irqsave(&msg_queue
->lock
, flags
);
215 list_add(&msg
->list
, &msg_queue
->head
);
216 spin_unlock_irqrestore(&msg_queue
->lock
, flags
);
217 platform_send_ipi_cpu(cpu
);
220 while (!cpus_empty(msg
->call_struct
.waitmask
))
221 blackfin_dcache_invalidate_range(
222 (unsigned long)(&msg
->call_struct
.waitmask
),
223 (unsigned long)(&msg
->call_struct
.waitmask
));
228 EXPORT_SYMBOL_GPL(smp_call_function
);
230 int smp_call_function_single(int cpuid
, void (*func
) (void *info
), void *info
,
233 unsigned int cpu
= cpuid
;
236 struct ipi_message_queue
*msg_queue
;
237 struct ipi_message
*msg
;
239 if (cpu_is_offline(cpu
))
242 cpu_set(cpu
, callmap
);
244 msg
= kmalloc(sizeof(*msg
), GFP_ATOMIC
);
245 INIT_LIST_HEAD(&msg
->list
);
246 msg
->call_struct
.func
= func
;
247 msg
->call_struct
.info
= info
;
248 msg
->call_struct
.wait
= wait
;
249 msg
->call_struct
.pending
= callmap
;
250 msg
->call_struct
.waitmask
= callmap
;
251 msg
->type
= BFIN_IPI_CALL_FUNC
;
253 msg_queue
= &per_cpu(ipi_msg_queue
, cpu
);
254 spin_lock_irqsave(&msg_queue
->lock
, flags
);
255 list_add(&msg
->list
, &msg_queue
->head
);
256 spin_unlock_irqrestore(&msg_queue
->lock
, flags
);
257 platform_send_ipi_cpu(cpu
);
260 while (!cpus_empty(msg
->call_struct
.waitmask
))
261 blackfin_dcache_invalidate_range(
262 (unsigned long)(&msg
->call_struct
.waitmask
),
263 (unsigned long)(&msg
->call_struct
.waitmask
));
268 EXPORT_SYMBOL_GPL(smp_call_function_single
);
270 void smp_send_reschedule(int cpu
)
273 struct ipi_message_queue
*msg_queue
;
274 struct ipi_message
*msg
;
276 if (cpu_is_offline(cpu
))
279 msg
= kmalloc(sizeof(*msg
), GFP_ATOMIC
);
280 memset(msg
, 0, sizeof(msg
));
281 INIT_LIST_HEAD(&msg
->list
);
282 msg
->type
= BFIN_IPI_RESCHEDULE
;
284 msg_queue
= &per_cpu(ipi_msg_queue
, cpu
);
285 spin_lock_irqsave(&msg_queue
->lock
, flags
);
286 list_add(&msg
->list
, &msg_queue
->head
);
287 spin_unlock_irqrestore(&msg_queue
->lock
, flags
);
288 platform_send_ipi_cpu(cpu
);
293 void smp_send_stop(void)
298 struct ipi_message_queue
*msg_queue
;
299 struct ipi_message
*msg
;
301 callmap
= cpu_online_map
;
302 cpu_clear(smp_processor_id(), callmap
);
303 if (cpus_empty(callmap
))
306 msg
= kmalloc(sizeof(*msg
), GFP_ATOMIC
);
307 memset(msg
, 0, sizeof(msg
));
308 INIT_LIST_HEAD(&msg
->list
);
309 msg
->type
= BFIN_IPI_CPU_STOP
;
311 for_each_cpu_mask(cpu
, callmap
) {
312 msg_queue
= &per_cpu(ipi_msg_queue
, cpu
);
313 spin_lock_irqsave(&msg_queue
->lock
, flags
);
314 list_add(&msg
->list
, &msg_queue
->head
);
315 spin_unlock_irqrestore(&msg_queue
->lock
, flags
);
316 platform_send_ipi_cpu(cpu
);
321 int __cpuinit
__cpu_up(unsigned int cpu
)
323 struct task_struct
*idle
;
326 idle
= fork_idle(cpu
);
328 printk(KERN_ERR
"CPU%u: fork() failed\n", cpu
);
329 return PTR_ERR(idle
);
332 secondary_stack
= task_stack_page(idle
) + THREAD_SIZE
;
335 ret
= platform_boot_secondary(cpu
, idle
);
338 cpu_clear(cpu
, cpu_present_map
);
339 printk(KERN_CRIT
"CPU%u: processor failed to boot (%d)\n", cpu
, ret
);
342 cpu_set(cpu
, cpu_online_map
);
344 secondary_stack
= NULL
;
349 static void __cpuinit
setup_secondary(unsigned int cpu
)
351 #ifndef CONFIG_TICK_SOURCE_SYSTMR0
352 struct irq_desc
*timer_desc
;
358 ilat
= bfin_read_ILAT();
360 bfin_write_ILAT(ilat
);
363 /* Reserve the PDA space for the secondary CPU. */
366 /* Enable interrupt levels IVG7-15. IARs have been already
367 * programmed by the boot CPU. */
368 bfin_irq_flags
|= IMASK_IVG15
|
369 IMASK_IVG14
| IMASK_IVG13
| IMASK_IVG12
| IMASK_IVG11
|
370 IMASK_IVG10
| IMASK_IVG9
| IMASK_IVG8
| IMASK_IVG7
| IMASK_IVGHW
;
372 #ifdef CONFIG_TICK_SOURCE_SYSTMR0
373 /* Power down the core timer, just to play safe. */
376 /* system timer0 has been setup by CoreA. */
378 timer_desc
= irq_desc
+ IRQ_CORETMR
;
380 timer_desc
->chip
->enable(IRQ_CORETMR
);
384 void __cpuinit
secondary_start_kernel(void)
386 unsigned int cpu
= smp_processor_id();
387 struct mm_struct
*mm
= &init_mm
;
389 if (_bfin_swrst
& SWRST_DBL_FAULT_B
) {
390 printk(KERN_EMERG
"CoreB Recovering from DOUBLE FAULT event\n");
391 #ifdef CONFIG_DEBUG_DOUBLEFAULT
392 printk(KERN_EMERG
" While handling exception (EXCAUSE = 0x%x) at %pF\n",
393 (int)init_saved_seqstat_coreb
& SEQSTAT_EXCAUSE
, init_saved_retx_coreb
);
394 printk(KERN_NOTICE
" DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr_coreb
);
395 printk(KERN_NOTICE
" ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr_coreb
);
397 printk(KERN_NOTICE
" The instruction at %pF caused a double exception\n",
402 * We want the D-cache to be enabled early, in case the atomic
403 * support code emulates cache coherence (see
404 * __ARCH_SYNC_CORE_DCACHE).
406 init_exception_vectors();
408 bfin_setup_caches(cpu
);
412 /* Attach the new idle task to the global mm. */
413 atomic_inc(&mm
->mm_users
);
414 atomic_inc(&mm
->mm_count
);
415 current
->active_mm
= mm
;
416 BUG_ON(current
->mm
); /* Can't be, but better be safe than sorry. */
420 setup_secondary(cpu
);
424 platform_secondary_init(cpu
);
429 void __init
smp_prepare_boot_cpu(void)
433 void __init
smp_prepare_cpus(unsigned int max_cpus
)
435 platform_prepare_cpus(max_cpus
);
437 platform_request_ipi(&ipi_handler
);
440 void __init
smp_cpus_done(unsigned int max_cpus
)
442 unsigned long bogosum
= 0;
445 for_each_online_cpu(cpu
)
446 bogosum
+= per_cpu(cpu_data
, cpu
).loops_per_jiffy
;
448 printk(KERN_INFO
"SMP: Total of %d processors activated "
449 "(%lu.%02lu BogoMIPS).\n",
451 bogosum
/ (500000/HZ
),
452 (bogosum
/ (5000/HZ
)) % 100);
455 void smp_icache_flush_range_others(unsigned long start
, unsigned long end
)
457 smp_flush_data
.start
= start
;
458 smp_flush_data
.end
= end
;
460 if (smp_call_function(&ipi_flush_icache
, &smp_flush_data
, 1))
461 printk(KERN_WARNING
"SMP: failed to run I-cache flush request on other CPUs\n");
463 EXPORT_SYMBOL_GPL(smp_icache_flush_range_others
);
465 #ifdef __ARCH_SYNC_CORE_DCACHE
466 unsigned long barrier_mask
__attribute__ ((__section__(".l2.bss")));
468 void resync_core_dcache(void)
470 unsigned int cpu
= get_cpu();
471 blackfin_invalidate_entire_dcache();
472 ++per_cpu(cpu_data
, cpu
).dcache_invld_count
;
475 EXPORT_SYMBOL(resync_core_dcache
);