Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
965
arch/m32r/kernel/smp.c
Normal file
965
arch/m32r/kernel/smp.c
Normal file
@@ -0,0 +1,965 @@
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/*
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* linux/arch/m32r/kernel/smp.c
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*
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* M32R SMP support routines.
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*
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* Copyright (c) 2001, 2002 Hitoshi Yamamoto
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*
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* Taken from i386 version.
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* (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
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* (c) 1998-99, 2000 Ingo Molnar <mingo@redhat.com>
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*
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* This code is released under the GNU General Public License version 2 or
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* later.
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*/
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#undef DEBUG_SMP
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/profile.h>
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#include <linux/cpu.h>
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#include <asm/cacheflush.h>
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#include <asm/pgalloc.h>
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#include <asm/atomic.h>
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#include <asm/io.h>
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#include <asm/mmu_context.h>
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#include <asm/m32r.h>
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/* Data structures and variables */
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/*
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* Structure and data for smp_call_function(). This is designed to minimise
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* static memory requirements. It also looks cleaner.
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*/
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static DEFINE_SPINLOCK(call_lock);
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struct call_data_struct {
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void (*func) (void *info);
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void *info;
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atomic_t started;
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atomic_t finished;
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int wait;
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} __attribute__ ((__aligned__(SMP_CACHE_BYTES)));
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static struct call_data_struct *call_data;
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/*
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* For flush_cache_all()
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*/
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static DEFINE_SPINLOCK(flushcache_lock);
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static volatile unsigned long flushcache_cpumask = 0;
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/*
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* For flush_tlb_others()
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*/
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static volatile cpumask_t flush_cpumask;
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static struct mm_struct *flush_mm;
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static struct vm_area_struct *flush_vma;
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static volatile unsigned long flush_va;
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static DEFINE_SPINLOCK(tlbstate_lock);
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#define FLUSH_ALL 0xffffffff
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DECLARE_PER_CPU(int, prof_multiplier);
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DECLARE_PER_CPU(int, prof_old_multiplier);
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DECLARE_PER_CPU(int, prof_counter);
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extern spinlock_t ipi_lock[];
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/* Function Prototypes */
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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void smp_send_reschedule(int);
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void smp_reschedule_interrupt(void);
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void smp_flush_cache_all(void);
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void smp_flush_cache_all_interrupt(void);
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void smp_flush_tlb_all(void);
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static void flush_tlb_all_ipi(void *);
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void smp_flush_tlb_mm(struct mm_struct *);
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void smp_flush_tlb_range(struct vm_area_struct *, unsigned long, \
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unsigned long);
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void smp_flush_tlb_page(struct vm_area_struct *, unsigned long);
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static void flush_tlb_others(cpumask_t, struct mm_struct *,
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struct vm_area_struct *, unsigned long);
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void smp_invalidate_interrupt(void);
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void smp_send_stop(void);
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static void stop_this_cpu(void *);
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int smp_call_function(void (*) (void *), void *, int, int);
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void smp_call_function_interrupt(void);
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void smp_send_timer(void);
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void smp_ipi_timer_interrupt(struct pt_regs *);
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void smp_local_timer_interrupt(struct pt_regs *);
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void send_IPI_allbutself(int, int);
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static void send_IPI_mask(cpumask_t, int, int);
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unsigned long send_IPI_mask_phys(cpumask_t, int, int);
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/* Rescheduling request Routines */
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/*==========================================================================*
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* Name: smp_send_reschedule
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*
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* Description: This routine requests other CPU to execute rescheduling.
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* 1.Send 'RESCHEDULE_IPI' to other CPU.
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* Request other CPU to execute 'smp_reschedule_interrupt()'.
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*
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* Born on Date: 2002.02.05
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*
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* Arguments: cpu_id - Target CPU ID
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*
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* Returns: void (cannot fail)
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*
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* Modification log:
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* Date Who Description
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* ---------- --- --------------------------------------------------------
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*
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*==========================================================================*/
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void smp_send_reschedule(int cpu_id)
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{
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WARN_ON(cpu_is_offline(cpu_id));
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send_IPI_mask(cpumask_of_cpu(cpu_id), RESCHEDULE_IPI, 1);
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}
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/*==========================================================================*
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* Name: smp_reschedule_interrupt
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*
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* Description: This routine executes on CPU which received
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* 'RESCHEDULE_IPI'.
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* Rescheduling is processed at the exit of interrupt
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* operation.
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*
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* Born on Date: 2002.02.05
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*
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* Arguments: NONE
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*
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* Returns: void (cannot fail)
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*
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||||
* Modification log:
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||||
* Date Who Description
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* ---------- --- --------------------------------------------------------
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*
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*==========================================================================*/
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void smp_reschedule_interrupt(void)
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{
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/* nothing to do */
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}
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/*==========================================================================*
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* Name: smp_flush_cache_all
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*
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* Description: This routine sends a 'INVALIDATE_CACHE_IPI' to all other
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* CPUs in the system.
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*
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* Born on Date: 2003-05-28
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*
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* Arguments: NONE
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*
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* Returns: void (cannot fail)
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*
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||||
* Modification log:
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||||
* Date Who Description
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* ---------- --- --------------------------------------------------------
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*
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*==========================================================================*/
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void smp_flush_cache_all(void)
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{
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cpumask_t cpumask;
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unsigned long *mask;
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preempt_disable();
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cpumask = cpu_online_map;
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cpu_clear(smp_processor_id(), cpumask);
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spin_lock(&flushcache_lock);
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mask=cpus_addr(cpumask);
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atomic_set_mask(*mask, (atomic_t *)&flushcache_cpumask);
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send_IPI_mask(cpumask, INVALIDATE_CACHE_IPI, 0);
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_flush_cache_copyback_all();
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while (flushcache_cpumask)
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mb();
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spin_unlock(&flushcache_lock);
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preempt_enable();
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}
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void smp_flush_cache_all_interrupt(void)
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{
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_flush_cache_copyback_all();
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clear_bit(smp_processor_id(), &flushcache_cpumask);
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}
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/* TLB flush request Routins */
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/*==========================================================================*
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* Name: smp_flush_tlb_all
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*
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* Description: This routine flushes all processes TLBs.
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* 1.Request other CPU to execute 'flush_tlb_all_ipi()'.
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* 2.Execute 'do_flush_tlb_all_local()'.
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*
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* Born on Date: 2002.02.05
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*
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* Arguments: NONE
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*
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* Returns: void (cannot fail)
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*
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||||
* Modification log:
|
||||
* Date Who Description
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||||
* ---------- --- --------------------------------------------------------
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*
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*==========================================================================*/
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void smp_flush_tlb_all(void)
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{
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unsigned long flags;
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preempt_disable();
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local_irq_save(flags);
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__flush_tlb_all();
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local_irq_restore(flags);
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smp_call_function(flush_tlb_all_ipi, 0, 1, 1);
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preempt_enable();
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}
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/*==========================================================================*
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* Name: flush_tlb_all_ipi
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*
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* Description: This routine flushes all local TLBs.
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* 1.Execute 'do_flush_tlb_all_local()'.
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*
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* Born on Date: 2002.02.05
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*
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* Arguments: *info - not used
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*
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* Returns: void (cannot fail)
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*
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||||
* Modification log:
|
||||
* Date Who Description
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||||
* ---------- --- --------------------------------------------------------
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*
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*==========================================================================*/
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static void flush_tlb_all_ipi(void *info)
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{
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__flush_tlb_all();
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}
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/*==========================================================================*
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* Name: smp_flush_tlb_mm
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*
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* Description: This routine flushes the specified mm context TLB's.
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*
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* Born on Date: 2002.02.05
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*
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* Arguments: *mm - a pointer to the mm struct for flush TLB
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*
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* Returns: void (cannot fail)
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*
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||||
* Modification log:
|
||||
* Date Who Description
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||||
* ---------- --- --------------------------------------------------------
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*
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*==========================================================================*/
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void smp_flush_tlb_mm(struct mm_struct *mm)
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{
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int cpu_id = smp_processor_id();
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cpumask_t cpu_mask;
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unsigned long *mmc = &mm->context[cpu_id];
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unsigned long flags;
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preempt_disable();
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cpu_mask = mm->cpu_vm_mask;
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cpu_clear(cpu_id, cpu_mask);
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if (*mmc != NO_CONTEXT) {
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local_irq_save(flags);
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*mmc = NO_CONTEXT;
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if (mm == current->mm)
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activate_context(mm);
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else
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cpu_clear(cpu_id, mm->cpu_vm_mask);
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local_irq_restore(flags);
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}
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if (!cpus_empty(cpu_mask))
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flush_tlb_others(cpu_mask, mm, NULL, FLUSH_ALL);
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preempt_enable();
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}
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/*==========================================================================*
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||||
* Name: smp_flush_tlb_range
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||||
*
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||||
* Description: This routine flushes a range of pages.
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||||
*
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||||
* Born on Date: 2002.02.05
|
||||
*
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||||
* Arguments: *mm - a pointer to the mm struct for flush TLB
|
||||
* start - not used
|
||||
* end - not used
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
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||||
void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
|
||||
unsigned long end)
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||||
{
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||||
smp_flush_tlb_mm(vma->vm_mm);
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||||
}
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|
||||
/*==========================================================================*
|
||||
* Name: smp_flush_tlb_page
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||||
*
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* Description: This routine flushes one page.
|
||||
*
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||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: *vma - a pointer to the vma struct include va
|
||||
* va - virtual address for flush TLB
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||||
*
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||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
|
||||
{
|
||||
struct mm_struct *mm = vma->vm_mm;
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||||
int cpu_id = smp_processor_id();
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cpumask_t cpu_mask;
|
||||
unsigned long *mmc = &mm->context[cpu_id];
|
||||
unsigned long flags;
|
||||
|
||||
preempt_disable();
|
||||
cpu_mask = mm->cpu_vm_mask;
|
||||
cpu_clear(cpu_id, cpu_mask);
|
||||
|
||||
#ifdef DEBUG_SMP
|
||||
if (!mm)
|
||||
BUG();
|
||||
#endif
|
||||
|
||||
if (*mmc != NO_CONTEXT) {
|
||||
local_irq_save(flags);
|
||||
va &= PAGE_MASK;
|
||||
va |= (*mmc & MMU_CONTEXT_ASID_MASK);
|
||||
__flush_tlb_page(va);
|
||||
local_irq_restore(flags);
|
||||
}
|
||||
if (!cpus_empty(cpu_mask))
|
||||
flush_tlb_others(cpu_mask, mm, vma, va);
|
||||
|
||||
preempt_enable();
|
||||
}
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: flush_tlb_others
|
||||
*
|
||||
* Description: This routine requests other CPU to execute flush TLB.
|
||||
* 1.Setup parmeters.
|
||||
* 2.Send 'INVALIDATE_TLB_IPI' to other CPU.
|
||||
* Request other CPU to execute 'smp_invalidate_interrupt()'.
|
||||
* 3.Wait for other CPUs operation finished.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: cpumask - bitmap of target CPUs
|
||||
* *mm - a pointer to the mm struct for flush TLB
|
||||
* *vma - a pointer to the vma struct include va
|
||||
* va - virtual address for flush TLB
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
|
||||
struct vm_area_struct *vma, unsigned long va)
|
||||
{
|
||||
unsigned long *mask;
|
||||
#ifdef DEBUG_SMP
|
||||
unsigned long flags;
|
||||
__save_flags(flags);
|
||||
if (!(flags & 0x0040)) /* Interrupt Disable NONONO */
|
||||
BUG();
|
||||
#endif /* DEBUG_SMP */
|
||||
|
||||
/*
|
||||
* A couple of (to be removed) sanity checks:
|
||||
*
|
||||
* - we do not send IPIs to not-yet booted CPUs.
|
||||
* - current CPU must not be in mask
|
||||
* - mask must exist :)
|
||||
*/
|
||||
BUG_ON(cpus_empty(cpumask));
|
||||
|
||||
BUG_ON(cpu_isset(smp_processor_id(), cpumask));
|
||||
BUG_ON(!mm);
|
||||
|
||||
/* If a CPU which we ran on has gone down, OK. */
|
||||
cpus_and(cpumask, cpumask, cpu_online_map);
|
||||
if (cpus_empty(cpumask))
|
||||
return;
|
||||
|
||||
/*
|
||||
* i'm not happy about this global shared spinlock in the
|
||||
* MM hot path, but we'll see how contended it is.
|
||||
* Temporarily this turns IRQs off, so that lockups are
|
||||
* detected by the NMI watchdog.
|
||||
*/
|
||||
spin_lock(&tlbstate_lock);
|
||||
|
||||
flush_mm = mm;
|
||||
flush_vma = vma;
|
||||
flush_va = va;
|
||||
mask=cpus_addr(cpumask);
|
||||
atomic_set_mask(*mask, (atomic_t *)&flush_cpumask);
|
||||
|
||||
/*
|
||||
* We have to send the IPI only to
|
||||
* CPUs affected.
|
||||
*/
|
||||
send_IPI_mask(cpumask, INVALIDATE_TLB_IPI, 0);
|
||||
|
||||
while (!cpus_empty(flush_cpumask)) {
|
||||
/* nothing. lockup detection does not belong here */
|
||||
mb();
|
||||
}
|
||||
|
||||
flush_mm = NULL;
|
||||
flush_vma = NULL;
|
||||
flush_va = 0;
|
||||
spin_unlock(&tlbstate_lock);
|
||||
}
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: smp_invalidate_interrupt
|
||||
*
|
||||
* Description: This routine executes on CPU which received
|
||||
* 'INVALIDATE_TLB_IPI'.
|
||||
* 1.Flush local TLB.
|
||||
* 2.Report flush TLB process was finished.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: NONE
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
void smp_invalidate_interrupt(void)
|
||||
{
|
||||
int cpu_id = smp_processor_id();
|
||||
unsigned long *mmc = &flush_mm->context[cpu_id];
|
||||
|
||||
if (!cpu_isset(cpu_id, flush_cpumask))
|
||||
return;
|
||||
|
||||
if (flush_va == FLUSH_ALL) {
|
||||
*mmc = NO_CONTEXT;
|
||||
if (flush_mm == current->active_mm)
|
||||
activate_context(flush_mm);
|
||||
else
|
||||
cpu_clear(cpu_id, flush_mm->cpu_vm_mask);
|
||||
} else {
|
||||
unsigned long va = flush_va;
|
||||
|
||||
if (*mmc != NO_CONTEXT) {
|
||||
va &= PAGE_MASK;
|
||||
va |= (*mmc & MMU_CONTEXT_ASID_MASK);
|
||||
__flush_tlb_page(va);
|
||||
}
|
||||
}
|
||||
cpu_clear(cpu_id, flush_cpumask);
|
||||
}
|
||||
|
||||
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
|
||||
/* Stop CPU request Routins */
|
||||
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: smp_send_stop
|
||||
*
|
||||
* Description: This routine requests stop all CPUs.
|
||||
* 1.Request other CPU to execute 'stop_this_cpu()'.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: NONE
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
void smp_send_stop(void)
|
||||
{
|
||||
smp_call_function(stop_this_cpu, NULL, 1, 0);
|
||||
}
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: stop_this_cpu
|
||||
*
|
||||
* Description: This routine halt CPU.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: NONE
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
static void stop_this_cpu(void *dummy)
|
||||
{
|
||||
int cpu_id = smp_processor_id();
|
||||
|
||||
/*
|
||||
* Remove this CPU:
|
||||
*/
|
||||
cpu_clear(cpu_id, cpu_online_map);
|
||||
|
||||
/*
|
||||
* PSW IE = 1;
|
||||
* IMASK = 0;
|
||||
* goto SLEEP
|
||||
*/
|
||||
local_irq_disable();
|
||||
outl(0, M32R_ICU_IMASK_PORTL);
|
||||
inl(M32R_ICU_IMASK_PORTL); /* dummy read */
|
||||
local_irq_enable();
|
||||
|
||||
for ( ; ; );
|
||||
}
|
||||
|
||||
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
|
||||
/* Call function Routins */
|
||||
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: smp_call_function
|
||||
*
|
||||
* Description: This routine sends a 'CALL_FUNCTION_IPI' to all other CPUs
|
||||
* in the system.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: *func - The function to run. This must be fast and
|
||||
* non-blocking.
|
||||
* *info - An arbitrary pointer to pass to the function.
|
||||
* nonatomic - currently unused.
|
||||
* wait - If true, wait (atomically) until function has
|
||||
* completed on other CPUs.
|
||||
*
|
||||
* Returns: 0 on success, else a negative status code. Does not return
|
||||
* until remote CPUs are nearly ready to execute <<func>> or
|
||||
* are or have executed.
|
||||
*
|
||||
* Cautions: You must not call this function with disabled interrupts or
|
||||
* from a hardware interrupt handler, you may call it from a
|
||||
* bottom half handler.
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
|
||||
int wait)
|
||||
{
|
||||
struct call_data_struct data;
|
||||
int cpus;
|
||||
|
||||
#ifdef DEBUG_SMP
|
||||
unsigned long flags;
|
||||
__save_flags(flags);
|
||||
if (!(flags & 0x0040)) /* Interrupt Disable NONONO */
|
||||
BUG();
|
||||
#endif /* DEBUG_SMP */
|
||||
|
||||
/* Holding any lock stops cpus from going down. */
|
||||
spin_lock(&call_lock);
|
||||
cpus = num_online_cpus() - 1;
|
||||
|
||||
if (!cpus) {
|
||||
spin_unlock(&call_lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Can deadlock when called with interrupts disabled */
|
||||
WARN_ON(irqs_disabled());
|
||||
|
||||
data.func = func;
|
||||
data.info = info;
|
||||
atomic_set(&data.started, 0);
|
||||
data.wait = wait;
|
||||
if (wait)
|
||||
atomic_set(&data.finished, 0);
|
||||
|
||||
call_data = &data;
|
||||
mb();
|
||||
|
||||
/* Send a message to all other CPUs and wait for them to respond */
|
||||
send_IPI_allbutself(CALL_FUNCTION_IPI, 0);
|
||||
|
||||
/* Wait for response */
|
||||
while (atomic_read(&data.started) != cpus)
|
||||
barrier();
|
||||
|
||||
if (wait)
|
||||
while (atomic_read(&data.finished) != cpus)
|
||||
barrier();
|
||||
spin_unlock(&call_lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: smp_call_function_interrupt
|
||||
*
|
||||
* Description: This routine executes on CPU which received
|
||||
* 'CALL_FUNCTION_IPI'.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: NONE
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
void smp_call_function_interrupt(void)
|
||||
{
|
||||
void (*func) (void *info) = call_data->func;
|
||||
void *info = call_data->info;
|
||||
int wait = call_data->wait;
|
||||
|
||||
/*
|
||||
* Notify initiating CPU that I've grabbed the data and am
|
||||
* about to execute the function
|
||||
*/
|
||||
mb();
|
||||
atomic_inc(&call_data->started);
|
||||
/*
|
||||
* At this point the info structure may be out of scope unless wait==1
|
||||
*/
|
||||
irq_enter();
|
||||
(*func)(info);
|
||||
irq_exit();
|
||||
|
||||
if (wait) {
|
||||
mb();
|
||||
atomic_inc(&call_data->finished);
|
||||
}
|
||||
}
|
||||
|
||||
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
|
||||
/* Timer Routins */
|
||||
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: smp_send_timer
|
||||
*
|
||||
* Description: This routine sends a 'LOCAL_TIMER_IPI' to all other CPUs
|
||||
* in the system.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: NONE
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
void smp_send_timer(void)
|
||||
{
|
||||
send_IPI_allbutself(LOCAL_TIMER_IPI, 1);
|
||||
}
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: smp_send_timer
|
||||
*
|
||||
* Description: This routine executes on CPU which received
|
||||
* 'LOCAL_TIMER_IPI'.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: *regs - a pointer to the saved regster info
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
void smp_ipi_timer_interrupt(struct pt_regs *regs)
|
||||
{
|
||||
irq_enter();
|
||||
smp_local_timer_interrupt(regs);
|
||||
irq_exit();
|
||||
}
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: smp_local_timer_interrupt
|
||||
*
|
||||
* Description: Local timer interrupt handler. It does both profiling and
|
||||
* process statistics/rescheduling.
|
||||
* We do profiling in every local tick, statistics/rescheduling
|
||||
* happen only every 'profiling multiplier' ticks. The default
|
||||
* multiplier is 1 and it can be changed by writing the new
|
||||
* multiplier value into /proc/profile.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: *regs - a pointer to the saved regster info
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Original: arch/i386/kernel/apic.c
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
* 2003-06-24 hy use per_cpu structure.
|
||||
*==========================================================================*/
|
||||
void smp_local_timer_interrupt(struct pt_regs *regs)
|
||||
{
|
||||
int user = user_mode(regs);
|
||||
int cpu_id = smp_processor_id();
|
||||
|
||||
/*
|
||||
* The profiling function is SMP safe. (nothing can mess
|
||||
* around with "current", and the profiling counters are
|
||||
* updated with atomic operations). This is especially
|
||||
* useful with a profiling multiplier != 1
|
||||
*/
|
||||
|
||||
profile_tick(CPU_PROFILING, regs);
|
||||
|
||||
if (--per_cpu(prof_counter, cpu_id) <= 0) {
|
||||
/*
|
||||
* The multiplier may have changed since the last time we got
|
||||
* to this point as a result of the user writing to
|
||||
* /proc/profile. In this case we need to adjust the APIC
|
||||
* timer accordingly.
|
||||
*
|
||||
* Interrupts are already masked off at this point.
|
||||
*/
|
||||
per_cpu(prof_counter, cpu_id)
|
||||
= per_cpu(prof_multiplier, cpu_id);
|
||||
if (per_cpu(prof_counter, cpu_id)
|
||||
!= per_cpu(prof_old_multiplier, cpu_id))
|
||||
{
|
||||
per_cpu(prof_old_multiplier, cpu_id)
|
||||
= per_cpu(prof_counter, cpu_id);
|
||||
}
|
||||
|
||||
update_process_times(user);
|
||||
}
|
||||
}
|
||||
|
||||
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
|
||||
/* Send IPI Routins */
|
||||
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: send_IPI_allbutself
|
||||
*
|
||||
* Description: This routine sends a IPI to all other CPUs in the system.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: ipi_num - Number of IPI
|
||||
* try - 0 : Send IPI certainly.
|
||||
* !0 : The following IPI is not sended when Target CPU
|
||||
* has not received the before IPI.
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
void send_IPI_allbutself(int ipi_num, int try)
|
||||
{
|
||||
cpumask_t cpumask;
|
||||
|
||||
cpumask = cpu_online_map;
|
||||
cpu_clear(smp_processor_id(), cpumask);
|
||||
|
||||
send_IPI_mask(cpumask, ipi_num, try);
|
||||
}
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: send_IPI_mask
|
||||
*
|
||||
* Description: This routine sends a IPI to CPUs in the system.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: cpu_mask - Bitmap of target CPUs logical ID
|
||||
* ipi_num - Number of IPI
|
||||
* try - 0 : Send IPI certainly.
|
||||
* !0 : The following IPI is not sended when Target CPU
|
||||
* has not received the before IPI.
|
||||
*
|
||||
* Returns: void (cannot fail)
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
static void send_IPI_mask(cpumask_t cpumask, int ipi_num, int try)
|
||||
{
|
||||
cpumask_t physid_mask, tmp;
|
||||
int cpu_id, phys_id;
|
||||
int num_cpus = num_online_cpus();
|
||||
|
||||
if (num_cpus <= 1) /* NO MP */
|
||||
return;
|
||||
|
||||
cpus_and(tmp, cpumask, cpu_online_map);
|
||||
BUG_ON(!cpus_equal(cpumask, tmp));
|
||||
|
||||
physid_mask = CPU_MASK_NONE;
|
||||
for_each_cpu_mask(cpu_id, cpumask){
|
||||
if ((phys_id = cpu_to_physid(cpu_id)) != -1)
|
||||
cpu_set(phys_id, physid_mask);
|
||||
}
|
||||
|
||||
send_IPI_mask_phys(physid_mask, ipi_num, try);
|
||||
}
|
||||
|
||||
/*==========================================================================*
|
||||
* Name: send_IPI_mask_phys
|
||||
*
|
||||
* Description: This routine sends a IPI to other CPUs in the system.
|
||||
*
|
||||
* Born on Date: 2002.02.05
|
||||
*
|
||||
* Arguments: cpu_mask - Bitmap of target CPUs physical ID
|
||||
* ipi_num - Number of IPI
|
||||
* try - 0 : Send IPI certainly.
|
||||
* !0 : The following IPI is not sended when Target CPU
|
||||
* has not received the before IPI.
|
||||
*
|
||||
* Returns: IPICRi regster value.
|
||||
*
|
||||
* Modification log:
|
||||
* Date Who Description
|
||||
* ---------- --- --------------------------------------------------------
|
||||
*
|
||||
*==========================================================================*/
|
||||
unsigned long send_IPI_mask_phys(cpumask_t physid_mask, int ipi_num,
|
||||
int try)
|
||||
{
|
||||
spinlock_t *ipilock;
|
||||
unsigned long flags = 0;
|
||||
volatile unsigned long *ipicr_addr;
|
||||
unsigned long ipicr_val;
|
||||
unsigned long my_physid_mask;
|
||||
unsigned long mask = cpus_addr(physid_mask)[0];
|
||||
|
||||
|
||||
if (mask & ~physids_coerce(phys_cpu_present_map))
|
||||
BUG();
|
||||
if (ipi_num >= NR_IPIS)
|
||||
BUG();
|
||||
|
||||
mask <<= IPI_SHIFT;
|
||||
ipilock = &ipi_lock[ipi_num];
|
||||
ipicr_addr = (volatile unsigned long *)(M32R_ICU_IPICR_ADDR
|
||||
+ (ipi_num << 2));
|
||||
my_physid_mask = ~(1 << smp_processor_id());
|
||||
|
||||
/*
|
||||
* lock ipi_lock[i]
|
||||
* check IPICRi == 0
|
||||
* write IPICRi (send IPIi)
|
||||
* unlock ipi_lock[i]
|
||||
*/
|
||||
__asm__ __volatile__ (
|
||||
";; LOCK ipi_lock[i] \n\t"
|
||||
".fillinsn \n"
|
||||
"1: \n\t"
|
||||
"mvfc %1, psw \n\t"
|
||||
"clrpsw #0x40 -> nop \n\t"
|
||||
DCACHE_CLEAR("r4", "r5", "%2")
|
||||
"lock r4, @%2 \n\t"
|
||||
"addi r4, #-1 \n\t"
|
||||
"unlock r4, @%2 \n\t"
|
||||
"mvtc %1, psw \n\t"
|
||||
"bnez r4, 2f \n\t"
|
||||
LOCK_SECTION_START(".balign 4 \n\t")
|
||||
".fillinsn \n"
|
||||
"2: \n\t"
|
||||
"ld r4, @%2 \n\t"
|
||||
"blez r4, 2b \n\t"
|
||||
"bra 1b \n\t"
|
||||
LOCK_SECTION_END
|
||||
";; CHECK IPICRi == 0 \n\t"
|
||||
".fillinsn \n"
|
||||
"3: \n\t"
|
||||
"ld %0, @%3 \n\t"
|
||||
"and %0, %6 \n\t"
|
||||
"beqz %0, 4f \n\t"
|
||||
"bnez %5, 5f \n\t"
|
||||
"bra 3b \n\t"
|
||||
";; WRITE IPICRi (send IPIi) \n\t"
|
||||
".fillinsn \n"
|
||||
"4: \n\t"
|
||||
"st %4, @%3 \n\t"
|
||||
";; UNLOCK ipi_lock[i] \n\t"
|
||||
".fillinsn \n"
|
||||
"5: \n\t"
|
||||
"ldi r4, #1 \n\t"
|
||||
"st r4, @%2 \n\t"
|
||||
: "=&r"(ipicr_val)
|
||||
: "r"(flags), "r"(&ipilock->slock), "r"(ipicr_addr),
|
||||
"r"(mask), "r"(try), "r"(my_physid_mask)
|
||||
: "memory", "r4"
|
||||
#ifdef CONFIG_CHIP_M32700_TS1
|
||||
, "r5"
|
||||
#endif /* CONFIG_CHIP_M32700_TS1 */
|
||||
);
|
||||
|
||||
return ipicr_val;
|
||||
}
|
||||
Reference in New Issue
Block a user