191 lines
3.9 KiB
C
191 lines
3.9 KiB
C
#include <linux/cpumask.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/kernel_stat.h>
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#include <linux/mc146818rtc.h>
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#include <linux/cache.h>
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#include <linux/cpu.h>
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#include <linux/module.h>
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#include <asm/smp.h>
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#include <asm/mtrr.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu_context.h>
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#include <asm/apic.h>
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#include <asm/proto.h>
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#ifdef CONFIG_X86_32
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#include <mach_apic.h>
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#include <mach_ipi.h>
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/*
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* the following functions deal with sending IPIs between CPUs.
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*
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* We use 'broadcast', CPU->CPU IPIs and self-IPIs too.
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*/
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static inline int __prepare_ICR(unsigned int shortcut, int vector)
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{
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unsigned int icr = shortcut | APIC_DEST_LOGICAL;
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switch (vector) {
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default:
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icr |= APIC_DM_FIXED | vector;
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break;
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case NMI_VECTOR:
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icr |= APIC_DM_NMI;
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break;
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}
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return icr;
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}
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static inline int __prepare_ICR2(unsigned int mask)
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{
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return SET_APIC_DEST_FIELD(mask);
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}
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void __send_IPI_shortcut(unsigned int shortcut, int vector)
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{
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/*
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* Subtle. In the case of the 'never do double writes' workaround
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* we have to lock out interrupts to be safe. As we don't care
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* of the value read we use an atomic rmw access to avoid costly
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* cli/sti. Otherwise we use an even cheaper single atomic write
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* to the APIC.
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*/
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unsigned int cfg;
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/*
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* Wait for idle.
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*/
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apic_wait_icr_idle();
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/*
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* No need to touch the target chip field
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*/
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cfg = __prepare_ICR(shortcut, vector);
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/*
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* Send the IPI. The write to APIC_ICR fires this off.
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*/
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apic_write(APIC_ICR, cfg);
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}
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void send_IPI_self(int vector)
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{
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__send_IPI_shortcut(APIC_DEST_SELF, vector);
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}
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/*
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* This is used to send an IPI with no shorthand notation (the destination is
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* specified in bits 56 to 63 of the ICR).
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*/
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static inline void __send_IPI_dest_field(unsigned long mask, int vector)
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{
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unsigned long cfg;
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/*
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* Wait for idle.
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*/
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if (unlikely(vector == NMI_VECTOR))
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safe_apic_wait_icr_idle();
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else
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apic_wait_icr_idle();
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/*
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* prepare target chip field
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*/
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cfg = __prepare_ICR2(mask);
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apic_write(APIC_ICR2, cfg);
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/*
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* program the ICR
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*/
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cfg = __prepare_ICR(0, vector);
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/*
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* Send the IPI. The write to APIC_ICR fires this off.
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*/
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apic_write(APIC_ICR, cfg);
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}
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/*
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* This is only used on smaller machines.
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*/
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void send_IPI_mask_bitmask(const struct cpumask *cpumask, int vector)
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{
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unsigned long mask = cpumask_bits(cpumask)[0];
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unsigned long flags;
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local_irq_save(flags);
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WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
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__send_IPI_dest_field(mask, vector);
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local_irq_restore(flags);
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}
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void send_IPI_mask_sequence(const struct cpumask *mask, int vector)
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{
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unsigned long flags;
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unsigned int query_cpu;
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/*
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* Hack. The clustered APIC addressing mode doesn't allow us to send
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* to an arbitrary mask, so I do a unicasts to each CPU instead. This
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* should be modified to do 1 message per cluster ID - mbligh
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*/
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local_irq_save(flags);
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for_each_cpu(query_cpu, mask)
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__send_IPI_dest_field(cpu_to_logical_apicid(query_cpu), vector);
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local_irq_restore(flags);
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}
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void send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
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{
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unsigned long flags;
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unsigned int query_cpu;
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unsigned int this_cpu = smp_processor_id();
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/* See Hack comment above */
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local_irq_save(flags);
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for_each_cpu(query_cpu, mask)
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if (query_cpu != this_cpu)
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__send_IPI_dest_field(cpu_to_logical_apicid(query_cpu),
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vector);
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local_irq_restore(flags);
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}
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/* must come after the send_IPI functions above for inlining */
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static int convert_apicid_to_cpu(int apic_id)
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{
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int i;
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for_each_possible_cpu(i) {
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if (per_cpu(x86_cpu_to_apicid, i) == apic_id)
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return i;
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}
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return -1;
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}
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int safe_smp_processor_id(void)
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{
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int apicid, cpuid;
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if (!boot_cpu_has(X86_FEATURE_APIC))
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return 0;
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apicid = hard_smp_processor_id();
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if (apicid == BAD_APICID)
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return 0;
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cpuid = convert_apicid_to_cpu(apicid);
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return cpuid >= 0 ? cpuid : 0;
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}
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#endif
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