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[IA64] Optional method to purge the TLB on SN systems

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This patch adds an optional method for purging the TLB on SN IA64 systems.
The change should not affect any non-SN system.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Jack Steiner
2007-05-08 14:50:43 -07:00
committed by Tony Luck
parent 8737d59579
commit 3be44b9cc3
5 changed files with 162 additions and 10 deletions
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27
arch/ia64/kernel/irq_ia64.c
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@@ -39,6 +39,7 @@
#include <asm/machvec.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/tlbflush.h>
#ifdef CONFIG_PERFMON
# include <asm/perfmon.h>
@@ -127,8 +128,10 @@ void destroy_irq(unsigned int irq)
#ifdef CONFIG_SMP
# define IS_RESCHEDULE(vec) (vec == IA64_IPI_RESCHEDULE)
# define IS_LOCAL_TLB_FLUSH(vec) (vec == IA64_IPI_LOCAL_TLB_FLUSH)
#else
# define IS_RESCHEDULE(vec) (0)
# define IS_LOCAL_TLB_FLUSH(vec) (0)
#endif
/*
* That's where the IVT branches when we get an external
@@ -180,8 +183,11 @@ ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
ia64_srlz_d();
while (vector != IA64_SPURIOUS_INT_VECTOR) {
if (unlikely(IS_RESCHEDULE(vector)))
kstat_this_cpu.irqs[vector]++;
if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
smp_local_flush_tlb();
kstat_this_cpu.irqs[vector]++;
} else if (unlikely(IS_RESCHEDULE(vector)))
kstat_this_cpu.irqs[vector]++;
else {
ia64_setreg(_IA64_REG_CR_TPR, vector);
ia64_srlz_d();
@@ -227,8 +233,11 @@ void ia64_process_pending_intr(void)
* Perform normal interrupt style processing
*/
while (vector != IA64_SPURIOUS_INT_VECTOR) {
if (unlikely(IS_RESCHEDULE(vector)))
kstat_this_cpu.irqs[vector]++;
if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
smp_local_flush_tlb();
kstat_this_cpu.irqs[vector]++;
} else if (unlikely(IS_RESCHEDULE(vector)))
kstat_this_cpu.irqs[vector]++;
else {
struct pt_regs *old_regs = set_irq_regs(NULL);
@@ -260,12 +269,12 @@ void ia64_process_pending_intr(void)
#ifdef CONFIG_SMP
extern irqreturn_t handle_IPI (int irq, void *dev_id);
static irqreturn_t dummy_handler (int irq, void *dev_id)
{
BUG();
}
extern irqreturn_t handle_IPI (int irq, void *dev_id);
static struct irqaction ipi_irqaction = {
.handler = handle_IPI,
@@ -278,6 +287,13 @@ static struct irqaction resched_irqaction = {
.flags = IRQF_DISABLED,
.name = "resched"
};
static struct irqaction tlb_irqaction = {
.handler = dummy_handler,
.flags = SA_INTERRUPT,
.name = "tlb_flush"
};
#endif
void
@@ -303,6 +319,7 @@ init_IRQ (void)
#ifdef CONFIG_SMP
register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction);
register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &tlb_irqaction);
#endif
#ifdef CONFIG_PERFMON
pfm_init_percpu();