@@ -5,7 +5,7 @@
#include <linux/threads.h>
#include <asm/irq.h>
-#define NR_IPI 8
+#define NR_IPI 9
typedef struct {
unsigned int __softirq_pending;
@@ -20,6 +20,9 @@
#define raw_smp_processor_id() (current_thread_info()->cpu)
+/* bitmap of IPIs that must be signalled using FIQ */
+#define SMP_IPI_FIQ_MASK 0x0100
+
struct seq_file;
/*
@@ -72,6 +72,7 @@ enum ipi_msg_type {
IPI_CPU_STOP,
IPI_IRQ_WORK,
IPI_COMPLETION,
+ IPI_FIQ,
};
static DECLARE_COMPLETION(cpu_running);
@@ -451,6 +452,7 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = {
S(IPI_CPU_STOP, "CPU stop interrupts"),
S(IPI_IRQ_WORK, "IRQ work interrupts"),
S(IPI_COMPLETION, "completion interrupts"),
+ S(IPI_FIQ, "FIQ interrupts"),
};
static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
@@ -618,6 +620,11 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
irq_exit();
break;
+ case IPI_FIQ:
+ BUILD_BUG_ON(SMP_IPI_FIQ_MASK != BIT(IPI_FIQ));
+ pr_warn("CPU%u: IPI FIQ delivered via IRQ vector\n", cpu);
+ break;
+
default:
printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n",
cpu, ipinr);
This patch introduces a new IPI intended to be routed to FIQ rather than IRQ. An IPI based upon FIQ can be used to implement debug features that require non-maskable interrupts. Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> Cc: Russell King <linux@arm.linux.org.uk> --- arch/arm/include/asm/hardirq.h | 2 +- arch/arm/include/asm/smp.h | 3 +++ arch/arm/kernel/smp.c | 7 +++++++ 3 files changed, 11 insertions(+), 1 deletion(-)