extern VOID
CPUMON_Remove_Cpuhooks (
void
)
{
#if defined(PERFMON_V1) || defined(PERFMON_V2_ALT)
int status;
SEP_PRINT_DEBUG("CPUMON_Remove_Cpuhooks: entered... pmv=0x%p \n", SYS_Read_PMV());
/*
* if Perfmon1 or Perfmon2_alt is set, we used the perfmon.c
* interface to steal perfmon.c's interrupt handler for our use.
* Now we must release it back.
* Don't free_irq() because perfmon.c still wants to use it
*/
status = CPUMON_REMOVE_INTERRUPT(&desc);
if (status) {
SEP_PRINT_WARNING("CPUMON_Remove_Cpuhooks: CPUMON_REMOVE_INTERRUPT returned: %d\n",status);
}
#elif !defined(PERFMON_V2)
SEP_PRINT_DEBUG("CPUMON_Remove_Cpuhooks: entered... pmv=0x%p \n", SYS_Read_PMV());
if (xchg(&pebs_irqaction, 0)) {
free_irq(ebs_irq, NULL);
}
#endif
SEP_PRINT_DEBUG("CPUMON_Remove_Cpuhooks: exit... pmv=0x%p \n", SYS_Read_PMV());
return;
}
extern VOID
UTILITY_Set_PMV_Mask (
VOID
)
{
U64 pmv;
pmv = SYS_Read_PMV();
pmv |= PMV_MASK_BIT;
SYS_Write_PMV(pmv);
return;
}
extern VOID
UTILITY_Clear_PMV_Mask (
VOID
)
{
U64 pmv;
pmv = SYS_Read_PMV();
pmv &= ~PMV_MASK_BIT;
SYS_Write_PMV(pmv);
return;
}
/*!
* @fn int CPUMON_Install_Cpuhooks(VOID)
* @brief Assign the PMU interrupt to the driver
*
* @return zero if successful, non-zero error value if something failed
*
* Install the driver ebs handler onto the PMU interrupt. If perfmon is
* compiled in then we ask perfmon for the interrupt, otherwise we ask the
* kernel...
*
* <I>Special Notes:</I>
*
* @Note This routine is for Itanium(R)-based systems only!
*
* For IA32, the LBRs are not frozen when a PMU interrupt is taken.
* Since the LBRs capture information on every branch, for the LBR
* registers to be useful, we need to freeze them as quickly as
* possible after the interrupt. This means hooking the IDT directly
* to call a driver specific interrupt handler. That happens in the
* vtxsys.S file via samp_get_set_idt_entry. The real routine being
* called first upon PMU interrupt is t_ebs (in vtxsys.S) and that
* routine calls PMI_Interrupt_Handler()...
*
*/
extern void
CPUMON_Install_Cpuhooks (
void
)
{
int status = -1;
SEP_PRINT_DEBUG("CPUMON_Install_Cpuhooks: entered... pmv 0x%p \n", SYS_Read_PMV());
#if defined(PERFMON_V1) || defined(PERFMON_V2_ALT)
/*
* if Perfmon1 or Perfmon2_alt is set, we can use the perfmon.c
* interface to steal perfmon.c's interrupt handler for our use
* perfmon.c has already done register_percpu_irq()
*/
ebs_irq = SEP_PERFMON_IRQ;
desc.handler = &PMI_Interrupt_Handler;
status = CPUMON_INSTALL_INTERRUPT(&desc);
if (status) {
SEP_PRINT_ERROR("CPUMON_Install_Cpuhooks: CPUMON_INSTALL_INTERRUPT returned %d\n",status);
}
#elif !defined(PERFMON_V2)
if (pebs_irqaction) {
return status;
}
#ifdef SA_PERCPU_IRQ_SUPPORTED
ebs_irq = SEP_PERFMON_IRQ;
pebs_irqaction = (struct irqaction *) 1;
status = request_irq(SEP_PERFMON_IRQ,
PMI_Interrupt_Handler,
SA_INTERRUPT | SA_PERCPU_IRQ,
"SEP Sampling",
NULL);
#else
{
pebs_irqaction = kmalloc(sizeof (struct irqaction), GFP_ATOMIC);
if (pebs_irqaction) {
memset(pebs_irqaction, 0, sizeof (struct irqaction));
ebs_irq = SEP_PERFMON_IRQ;
pebs_irqaction->handler = (void *)PMI_Interrupt_Handler;
pebs_irqaction->flags = SA_INTERRUPT;
pebs_irqaction->name = SEP_DRIVER_NAME;
pebs_irqaction->dev_id = NULL;
register_percpu_irq(ebs_irq, pebs_irqaction);
status = 0;
}
else {
SEP_PRINT_WARNING("couldn't kmalloc pebs_irqaction (%d bytes)\n",
(int)sizeof(struct irqaction));
}
}
#endif
#endif
SEP_PRINT("IRQ vector 0x%x will be used for handling PMU interrupts\n", SEP_PERFMON_IRQ);
SEP_PRINT_DEBUG("CPUMON_Install_Cpuhooks: exit...... rc=0x%x pmv=0x%p \n",
status, SYS_Read_PMV());
return;
}
