mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Ingo Molnar](/assets/img/avatar_default.png)
Bye-bye Performance Counters, welcome Performance Events! In the past few months the perfcounters subsystem has grown out its initial role of counting hardware events, and has become (and is becoming) a much broader generic event enumeration, reporting, logging, monitoring, analysis facility. Naming its core object 'perf_counter' and naming the subsystem 'perfcounters' has become more and more of a misnomer. With pending code like hw-breakpoints support the 'counter' name is less and less appropriate. All in one, we've decided to rename the subsystem to 'performance events' and to propagate this rename through all fields, variables and API names. (in an ABI compatible fashion) The word 'event' is also a bit shorter than 'counter' - which makes it slightly more convenient to write/handle as well. Thanks goes to Stephane Eranian who first observed this misnomer and suggested a rename. User-space tooling and ABI compatibility is not affected - this patch should be function-invariant. (Also, defconfigs were not touched to keep the size down.) This patch has been generated via the following script: FILES=$(find * -type f | grep -vE 'oprofile|[^K]config') sed -i \ -e 's/PERF_EVENT_/PERF_RECORD_/g' \ -e 's/PERF_COUNTER/PERF_EVENT/g' \ -e 's/perf_counter/perf_event/g' \ -e 's/nb_counters/nb_events/g' \ -e 's/swcounter/swevent/g' \ -e 's/tpcounter_event/tp_event/g' \ $FILES for N in $(find . -name perf_counter.[ch]); do M=$(echo $N | sed 's/perf_counter/perf_event/g') mv $N $M done FILES=$(find . -name perf_event.*) sed -i \ -e 's/COUNTER_MASK/REG_MASK/g' \ -e 's/COUNTER/EVENT/g' \ -e 's/\<event\>/event_id/g' \ -e 's/counter/event/g' \ -e 's/Counter/Event/g' \ $FILES ... to keep it as correct as possible. This script can also be used by anyone who has pending perfcounters patches - it converts a Linux kernel tree over to the new naming. We tried to time this change to the point in time where the amount of pending patches is the smallest: the end of the merge window. Namespace clashes were fixed up in a preparatory patch - and some stylistic fallout will be fixed up in a subsequent patch. ( NOTE: 'counters' are still the proper terminology when we deal with hardware registers - and these sed scripts are a bit over-eager in renaming them. I've undone some of that, but in case there's something left where 'counter' would be better than 'event' we can undo that on an individual basis instead of touching an otherwise nicely automated patch. ) Suggested-by: Stephane Eranian <eranian@google.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Paul Mackerras <paulus@samba.org> Reviewed-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Howells <dhowells@redhat.com> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: <linux-arch@vger.kernel.org> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
251 lines
6.4 KiB
C
251 lines
6.4 KiB
C
#include <linux/linkage.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/random.h>
|
|
#include <linux/kprobes.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/sysdev.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/io.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <asm/atomic.h>
|
|
#include <asm/system.h>
|
|
#include <asm/timer.h>
|
|
#include <asm/hw_irq.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/desc.h>
|
|
#include <asm/apic.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/i8259.h>
|
|
#include <asm/traps.h>
|
|
|
|
/*
|
|
* ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
|
|
* (these are usually mapped to vectors 0x30-0x3f)
|
|
*/
|
|
|
|
/*
|
|
* The IO-APIC gives us many more interrupt sources. Most of these
|
|
* are unused but an SMP system is supposed to have enough memory ...
|
|
* sometimes (mostly wrt. hw bugs) we get corrupted vectors all
|
|
* across the spectrum, so we really want to be prepared to get all
|
|
* of these. Plus, more powerful systems might have more than 64
|
|
* IO-APIC registers.
|
|
*
|
|
* (these are usually mapped into the 0x30-0xff vector range)
|
|
*/
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* Note that on a 486, we don't want to do a SIGFPE on an irq13
|
|
* as the irq is unreliable, and exception 16 works correctly
|
|
* (ie as explained in the intel literature). On a 386, you
|
|
* can't use exception 16 due to bad IBM design, so we have to
|
|
* rely on the less exact irq13.
|
|
*
|
|
* Careful.. Not only is IRQ13 unreliable, but it is also
|
|
* leads to races. IBM designers who came up with it should
|
|
* be shot.
|
|
*/
|
|
|
|
static irqreturn_t math_error_irq(int cpl, void *dev_id)
|
|
{
|
|
outb(0, 0xF0);
|
|
if (ignore_fpu_irq || !boot_cpu_data.hard_math)
|
|
return IRQ_NONE;
|
|
math_error((void __user *)get_irq_regs()->ip);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* New motherboards sometimes make IRQ 13 be a PCI interrupt,
|
|
* so allow interrupt sharing.
|
|
*/
|
|
static struct irqaction fpu_irq = {
|
|
.handler = math_error_irq,
|
|
.name = "fpu",
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* IRQ2 is cascade interrupt to second interrupt controller
|
|
*/
|
|
static struct irqaction irq2 = {
|
|
.handler = no_action,
|
|
.name = "cascade",
|
|
};
|
|
|
|
DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
|
|
[0 ... IRQ0_VECTOR - 1] = -1,
|
|
[IRQ0_VECTOR] = 0,
|
|
[IRQ1_VECTOR] = 1,
|
|
[IRQ2_VECTOR] = 2,
|
|
[IRQ3_VECTOR] = 3,
|
|
[IRQ4_VECTOR] = 4,
|
|
[IRQ5_VECTOR] = 5,
|
|
[IRQ6_VECTOR] = 6,
|
|
[IRQ7_VECTOR] = 7,
|
|
[IRQ8_VECTOR] = 8,
|
|
[IRQ9_VECTOR] = 9,
|
|
[IRQ10_VECTOR] = 10,
|
|
[IRQ11_VECTOR] = 11,
|
|
[IRQ12_VECTOR] = 12,
|
|
[IRQ13_VECTOR] = 13,
|
|
[IRQ14_VECTOR] = 14,
|
|
[IRQ15_VECTOR] = 15,
|
|
[IRQ15_VECTOR + 1 ... NR_VECTORS - 1] = -1
|
|
};
|
|
|
|
int vector_used_by_percpu_irq(unsigned int vector)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_online_cpu(cpu) {
|
|
if (per_cpu(vector_irq, cpu)[vector] != -1)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __init init_ISA_irqs(void)
|
|
{
|
|
int i;
|
|
|
|
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
|
|
init_bsp_APIC();
|
|
#endif
|
|
init_8259A(0);
|
|
|
|
/*
|
|
* 16 old-style INTA-cycle interrupts:
|
|
*/
|
|
for (i = 0; i < NR_IRQS_LEGACY; i++) {
|
|
struct irq_desc *desc = irq_to_desc(i);
|
|
|
|
desc->status = IRQ_DISABLED;
|
|
desc->action = NULL;
|
|
desc->depth = 1;
|
|
|
|
set_irq_chip_and_handler_name(i, &i8259A_chip,
|
|
handle_level_irq, "XT");
|
|
}
|
|
}
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
x86_init.irqs.intr_init();
|
|
}
|
|
|
|
static void __init smp_intr_init(void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
|
|
/*
|
|
* The reschedule interrupt is a CPU-to-CPU reschedule-helper
|
|
* IPI, driven by wakeup.
|
|
*/
|
|
alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
|
|
|
|
/* IPIs for invalidation */
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+0, invalidate_interrupt0);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+1, invalidate_interrupt1);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+2, invalidate_interrupt2);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+3, invalidate_interrupt3);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+4, invalidate_interrupt4);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+5, invalidate_interrupt5);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+6, invalidate_interrupt6);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+7, invalidate_interrupt7);
|
|
|
|
/* IPI for generic function call */
|
|
alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
|
|
|
|
/* IPI for generic single function call */
|
|
alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
|
|
call_function_single_interrupt);
|
|
|
|
/* Low priority IPI to cleanup after moving an irq */
|
|
set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
|
|
set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
|
|
|
|
/* IPI used for rebooting/stopping */
|
|
alloc_intr_gate(REBOOT_VECTOR, reboot_interrupt);
|
|
#endif
|
|
#endif /* CONFIG_SMP */
|
|
}
|
|
|
|
static void __init apic_intr_init(void)
|
|
{
|
|
smp_intr_init();
|
|
|
|
#ifdef CONFIG_X86_THERMAL_VECTOR
|
|
alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
|
|
#endif
|
|
#ifdef CONFIG_X86_MCE_THRESHOLD
|
|
alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
|
|
#endif
|
|
#if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_LOCAL_APIC)
|
|
alloc_intr_gate(MCE_SELF_VECTOR, mce_self_interrupt);
|
|
#endif
|
|
|
|
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
|
|
/* self generated IPI for local APIC timer */
|
|
alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
|
|
|
|
/* generic IPI for platform specific use */
|
|
alloc_intr_gate(GENERIC_INTERRUPT_VECTOR, generic_interrupt);
|
|
|
|
/* IPI vectors for APIC spurious and error interrupts */
|
|
alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
|
|
alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
|
|
|
|
/* Performance monitoring interrupts: */
|
|
# ifdef CONFIG_PERF_EVENTS
|
|
alloc_intr_gate(LOCAL_PENDING_VECTOR, perf_pending_interrupt);
|
|
# endif
|
|
|
|
#endif
|
|
}
|
|
|
|
void __init native_init_IRQ(void)
|
|
{
|
|
int i;
|
|
|
|
/* Execute any quirks before the call gates are initialised: */
|
|
x86_init.irqs.pre_vector_init();
|
|
|
|
apic_intr_init();
|
|
|
|
/*
|
|
* Cover the whole vector space, no vector can escape
|
|
* us. (some of these will be overridden and become
|
|
* 'special' SMP interrupts)
|
|
*/
|
|
for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) {
|
|
/* IA32_SYSCALL_VECTOR could be used in trap_init already. */
|
|
if (!test_bit(i, used_vectors))
|
|
set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]);
|
|
}
|
|
|
|
if (!acpi_ioapic)
|
|
setup_irq(2, &irq2);
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* External FPU? Set up irq13 if so, for
|
|
* original braindamaged IBM FERR coupling.
|
|
*/
|
|
if (boot_cpu_data.hard_math && !cpu_has_fpu)
|
|
setup_irq(FPU_IRQ, &fpu_irq);
|
|
|
|
irq_ctx_init(smp_processor_id());
|
|
#endif
|
|
}
|