2008-03-03 20:12:53 +03:00
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#include <linux/cpumask.h>
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#include <linux/interrupt.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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2009-02-17 15:58:15 +03:00
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#include <asm/apic.h>
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2008-03-03 20:12:53 +03:00
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#include <asm/proto.h>
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2009-01-30 06:31:49 +03:00
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#include <asm/ipi.h>
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2008-03-03 20:12:53 +03:00
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2016-03-06 21:11:15 +03:00
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void __default_send_IPI_shortcut(unsigned int shortcut, int vector, unsigned int dest)
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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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__xapic_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, dest);
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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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native_apic_mem_write(APIC_ICR, cfg);
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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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void __default_send_IPI_dest_field(unsigned int mask, int vector, unsigned int dest)
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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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__xapic_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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native_apic_mem_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, dest);
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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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native_apic_mem_write(APIC_ICR, cfg);
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}
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2015-11-05 01:57:01 +03:00
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void default_send_IPI_single_phys(int cpu, int vector)
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{
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unsigned long flags;
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local_irq_save(flags);
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__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid, cpu),
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vector, APIC_DEST_PHYSICAL);
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local_irq_restore(flags);
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}
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2009-01-31 04:29:27 +03:00
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void default_send_IPI_mask_sequence_phys(const struct cpumask *mask, int vector)
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{
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unsigned long query_cpu;
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unsigned long flags;
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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 unicast to each CPU instead.
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* - 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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__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
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query_cpu), vector, APIC_DEST_PHYSICAL);
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}
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local_irq_restore(flags);
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}
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void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
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int vector)
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{
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unsigned int this_cpu = smp_processor_id();
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unsigned int query_cpu;
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unsigned long flags;
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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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continue;
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__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
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query_cpu), vector, APIC_DEST_PHYSICAL);
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}
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local_irq_restore(flags);
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}
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2015-11-05 01:57:07 +03:00
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/*
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* Helper function for APICs which insist on cpumasks
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*/
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void default_send_IPI_single(int cpu, int vector)
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{
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apic->send_IPI_mask(cpumask_of(cpu), vector);
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}
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2011-01-23 16:37:29 +03:00
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#ifdef CONFIG_X86_32
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2009-01-31 04:29:27 +03:00
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void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
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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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__default_send_IPI_dest_field(
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2011-01-23 16:37:31 +03:00
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early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
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vector, apic->dest_logical);
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2009-01-31 04:29:27 +03:00
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local_irq_restore(flags);
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}
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void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
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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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continue;
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__default_send_IPI_dest_field(
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2011-01-23 16:37:31 +03:00
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early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
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vector, apic->dest_logical);
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2009-01-31 04:29:27 +03:00
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}
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local_irq_restore(flags);
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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 default_send_IPI_mask_logical(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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2013-01-18 21:58:47 +04:00
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if (!mask)
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x86: don't send an IPI to the empty set of CPU's
The default_send_IPI_mask_logical() function uses the "flat" APIC mode
to send an IPI to a set of CPU's at once, but if that set happens to be
empty, some older local APIC's will apparently be rather unhappy. So
just warn if a caller gives us an empty mask, and ignore it.
This fixes a regression in 2.6.30.x, due to commit 4595f9620 ("x86:
change flush_tlb_others to take a const struct cpumask"), documented
here:
http://bugzilla.kernel.org/show_bug.cgi?id=13933
which causes a silent lock-up. It only seems to happen on PPro, P2, P3
and Athlon XP cores. Most developers sadly (or not so sadly, if you're
a developer..) have more modern CPU's. Also, on x86-64 we don't use the
flat APIC mode, so it would never trigger there even if the APIC didn't
like sending an empty IPI mask.
Reported-by: Pavel Vilim <wylda@volny.cz>
Reported-and-tested-by: Thomas Björnell <thomas.bjornell@gmail.com>
Reported-and-tested-by: Martin Rogge <marogge@onlinehome.de>
Cc: Mike Travis <travis@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-08-21 20:23:57 +04:00
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return;
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2009-01-31 04:29:27 +03:00
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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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__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
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local_irq_restore(flags);
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}
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void default_send_IPI_allbutself(int vector)
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{
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/*
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* if there are no other CPUs in the system then we get an APIC send
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* error if we try to broadcast, thus avoid sending IPIs in this case.
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*/
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if (!(num_online_cpus() > 1))
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return;
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__default_local_send_IPI_allbutself(vector);
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}
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void default_send_IPI_all(int vector)
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{
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__default_local_send_IPI_all(vector);
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}
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2009-01-28 17:42:24 +03:00
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void default_send_IPI_self(int vector)
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2008-03-03 20:12:53 +03:00
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{
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2009-01-30 06:31:49 +03:00
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__default_send_IPI_shortcut(APIC_DEST_SELF, vector, apic->dest_logical);
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2008-03-03 20:12:53 +03:00
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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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2009-07-05 20:01:54 +04:00
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if (!cpu_has_apic)
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2008-03-03 20:12:53 +03:00
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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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