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ARM: 7536/1: smp: Formalize an IPI for wakeup

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Remove the offset from ipi_msg_type and assume that SGI0 is the
wakeup interrupt now that all WFI hotplug users call
gic_raise_softirq() with 0 instead of 1. This allows us to
track how many wakeup interrupts are sent and also removes the
unknown IPI printk message for WFI hotplug based systems.

Reviewed-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Stephen Boyd 2012-09-19 08:16:07 +01:00 • committed by Russell King
parent 38ef2ad5f1
commit 559a593905
2 changed files with 10 additions and 5 deletions
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2
arch/arm/include/asm/hardirq.h
View file

@ -5,7 +5,7 @@
#include <linux/threads.h> #include <linux/threads.h>
#include <asm/irq.h> #include <asm/irq.h>
#define NR_IPI 5 #define NR_IPI 6
typedef struct { typedef struct {
unsigned int __softirq_pending; unsigned int __softirq_pending;

13
arch/arm/kernel/smp.c
View file

@ -51,7 +51,8 @@
struct secondary_data secondary_data; struct secondary_data secondary_data;
enum ipi_msg_type { enum ipi_msg_type {
IPI_TIMER = 2, IPI_WAKEUP,
IPI_TIMER,
IPI_RESCHEDULE, IPI_RESCHEDULE,
IPI_CALL_FUNC, IPI_CALL_FUNC,
IPI_CALL_FUNC_SINGLE, IPI_CALL_FUNC_SINGLE,
@ -347,7 +348,8 @@ void arch_send_call_function_single_ipi(int cpu)
} }
static const char *ipi_types[NR_IPI] = { static const char *ipi_types[NR_IPI] = {
#define S(x,s) [x - IPI_TIMER] = s #define S(x,s) [x] = s
S(IPI_WAKEUP, "CPU wakeup interrupts"),
S(IPI_TIMER, "Timer broadcast interrupts"), S(IPI_TIMER, "Timer broadcast interrupts"),
S(IPI_RESCHEDULE, "Rescheduling interrupts"), S(IPI_RESCHEDULE, "Rescheduling interrupts"),
S(IPI_CALL_FUNC, "Function call interrupts"), S(IPI_CALL_FUNC, "Function call interrupts"),
@ -500,10 +502,13 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
unsigned int cpu = smp_processor_id(); unsigned int cpu = smp_processor_id();
struct pt_regs *old_regs = set_irq_regs(regs); struct pt_regs *old_regs = set_irq_regs(regs);
if (ipinr >= IPI_TIMER && ipinr < IPI_TIMER + NR_IPI) if (ipinr < NR_IPI)
__inc_irq_stat(cpu, ipi_irqs[ipinr - IPI_TIMER]); __inc_irq_stat(cpu, ipi_irqs[ipinr]);
switch (ipinr) { switch (ipinr) {
case IPI_WAKEUP:
break;
case IPI_TIMER: case IPI_TIMER:
irq_enter(); irq_enter();
ipi_timer(); ipi_timer();