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Date: Tue, 29 Jul 2008 01:05:33 -0700
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Ingo Molnar <mingo@...e.hu>
CC: Nick Piggin <nickpiggin@...oo.com.au>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andi Kleen <andi@...stfloor.org>
Subject: [PATCH 1/4] x86-32: use smp_call_function_mask for SMP TLB invalidations
Now that smp_call_function_mask exists and is scalable, there's no
reason to have a special TLB flush IPI. This saves a mass of code.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
arch/x86/kernel/apic_32.c | 3 -
arch/x86/kernel/tlb_32.c | 86 +++++------------------------
include/asm-x86/irq_vectors.h | 1
include/asm-x86/mach-default/entry_arch.h | 1
4 files changed, 17 insertions(+), 74 deletions(-)
===================================================================
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -1381,9 +1381,6 @@
*/
alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
- /* IPI for invalidation */
- alloc_intr_gate(INVALIDATE_TLB_VECTOR, invalidate_interrupt);
-
/* IPI for generic function call */
alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
===================================================================
--- a/arch/x86/kernel/tlb_32.c
+++ b/arch/x86/kernel/tlb_32.c
@@ -1,14 +1,12 @@
-#include <linux/spinlock.h>
#include <linux/cpu.h>
#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/percpu.h>
#include <asm/tlbflush.h>
DEFINE_PER_CPU(struct tlb_state, cpu_tlbstate)
____cacheline_aligned = { &init_mm, 0, };
-
-/* must come after the send_IPI functions above for inlining */
-#include <mach_ipi.h>
/*
* Smarter SMP flushing macros.
@@ -20,10 +18,10 @@
* Optimizations Manfred Spraul <manfred@...orfullife.com>
*/
-static cpumask_t flush_cpumask;
-static struct mm_struct *flush_mm;
-static unsigned long flush_va;
-static DEFINE_SPINLOCK(tlbstate_lock);
+struct tlb_flush {
+ struct mm_struct *mm;
+ unsigned long va;
+};
/*
* We cannot call mmdrop() because we are in interrupt context,
@@ -87,37 +85,23 @@
* 2) Leave the mm if we are in the lazy tlb mode.
*/
-void smp_invalidate_interrupt(struct pt_regs *regs)
+static void tlb_invalidate(void *arg)
{
+ struct tlb_flush *flush = arg;
unsigned long cpu;
cpu = get_cpu();
- if (!cpu_isset(cpu, flush_cpumask))
- goto out;
- /*
- * This was a BUG() but until someone can quote me the
- * line from the intel manual that guarantees an IPI to
- * multiple CPUs is retried _only_ on the erroring CPUs
- * its staying as a return
- *
- * BUG();
- */
-
- if (flush_mm == per_cpu(cpu_tlbstate, cpu).active_mm) {
+ if (flush->mm == per_cpu(cpu_tlbstate, cpu).active_mm) {
if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK) {
- if (flush_va == TLB_FLUSH_ALL)
+ if (flush->va == TLB_FLUSH_ALL)
local_flush_tlb();
else
- __flush_tlb_one(flush_va);
+ __flush_tlb_one(flush->va);
} else
leave_mm(cpu);
}
- ack_APIC_irq();
- smp_mb__before_clear_bit();
- cpu_clear(cpu, flush_cpumask);
- smp_mb__after_clear_bit();
-out:
+
put_cpu_no_resched();
__get_cpu_var(irq_stat).irq_tlb_count++;
}
@@ -125,48 +109,12 @@
void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
unsigned long va)
{
- cpumask_t cpumask = *cpumaskp;
+ struct tlb_flush flush = {
+ .mm = mm,
+ .va = va
+ };
- /*
- * A couple of (to be removed) sanity checks:
- *
- * - 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);
-
-#ifdef CONFIG_HOTPLUG_CPU
- /* If a CPU which we ran on has gone down, OK. */
- cpus_and(cpumask, cpumask, cpu_online_map);
- if (unlikely(cpus_empty(cpumask)))
- return;
-#endif
-
- /*
- * i'm not happy about this global shared spinlock in the
- * MM hot path, but we'll see how contended it is.
- * AK: x86-64 has a faster method that could be ported.
- */
- spin_lock(&tlbstate_lock);
-
- flush_mm = mm;
- flush_va = va;
- cpus_or(flush_cpumask, cpumask, flush_cpumask);
- /*
- * We have to send the IPI only to
- * CPUs affected.
- */
- send_IPI_mask(cpumask, INVALIDATE_TLB_VECTOR);
-
- while (!cpus_empty(flush_cpumask))
- /* nothing. lockup detection does not belong here */
- cpu_relax();
-
- flush_mm = NULL;
- flush_va = 0;
- spin_unlock(&tlbstate_lock);
+ smp_call_function_mask(*cpumaskp, tlb_invalidate, &flush, 1);
}
void flush_tlb_current_task(void)
===================================================================
--- a/include/asm-x86/irq_vectors.h
+++ b/include/asm-x86/irq_vectors.h
@@ -61,7 +61,6 @@
# define SPURIOUS_APIC_VECTOR 0xff
# define ERROR_APIC_VECTOR 0xfe
-# define INVALIDATE_TLB_VECTOR 0xfd
# define RESCHEDULE_VECTOR 0xfc
# define CALL_FUNCTION_VECTOR 0xfb
# define CALL_FUNCTION_SINGLE_VECTOR 0xfa
===================================================================
--- a/include/asm-x86/mach-default/entry_arch.h
+++ b/include/asm-x86/mach-default/entry_arch.h
@@ -11,7 +11,6 @@
*/
#ifdef CONFIG_X86_SMP
BUILD_INTERRUPT(reschedule_interrupt,RESCHEDULE_VECTOR)
-BUILD_INTERRUPT(invalidate_interrupt,INVALIDATE_TLB_VECTOR)
BUILD_INTERRUPT(call_function_interrupt,CALL_FUNCTION_VECTOR)
BUILD_INTERRUPT(call_function_single_interrupt,CALL_FUNCTION_SINGLE_VECTOR)
#endif
--
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