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Diffstat (limited to 'arch/powerpc/kernel/smp.c')
-rw-r--r--arch/powerpc/kernel/smp.c71
1 files changed, 63 insertions, 8 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index ff9f7010097d..8ac3f721d235 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -57,7 +57,6 @@
#define DBG(fmt...)
#endif
-int smp_hw_index[NR_CPUS];
struct thread_info *secondary_ti;
cpumask_t cpu_possible_map = CPU_MASK_NONE;
@@ -123,6 +122,65 @@ void smp_message_recv(int msg)
}
}
+static irqreturn_t call_function_action(int irq, void *data)
+{
+ generic_smp_call_function_interrupt();
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t reschedule_action(int irq, void *data)
+{
+ /* we just need the return path side effect of checking need_resched */
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t call_function_single_action(int irq, void *data)
+{
+ generic_smp_call_function_single_interrupt();
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t debug_ipi_action(int irq, void *data)
+{
+ smp_message_recv(PPC_MSG_DEBUGGER_BREAK);
+ return IRQ_HANDLED;
+}
+
+static irq_handler_t smp_ipi_action[] = {
+ [PPC_MSG_CALL_FUNCTION] = call_function_action,
+ [PPC_MSG_RESCHEDULE] = reschedule_action,
+ [PPC_MSG_CALL_FUNC_SINGLE] = call_function_single_action,
+ [PPC_MSG_DEBUGGER_BREAK] = debug_ipi_action,
+};
+
+const char *smp_ipi_name[] = {
+ [PPC_MSG_CALL_FUNCTION] = "ipi call function",
+ [PPC_MSG_RESCHEDULE] = "ipi reschedule",
+ [PPC_MSG_CALL_FUNC_SINGLE] = "ipi call function single",
+ [PPC_MSG_DEBUGGER_BREAK] = "ipi debugger",
+};
+
+/* optional function to request ipi, for controllers with >= 4 ipis */
+int smp_request_message_ipi(int virq, int msg)
+{
+ int err;
+
+ if (msg < 0 || msg > PPC_MSG_DEBUGGER_BREAK) {
+ return -EINVAL;
+ }
+#if !defined(CONFIG_DEBUGGER) && !defined(CONFIG_KEXEC)
+ if (msg == PPC_MSG_DEBUGGER_BREAK) {
+ return 1;
+ }
+#endif
+ err = request_irq(virq, smp_ipi_action[msg], IRQF_DISABLED|IRQF_PERCPU,
+ smp_ipi_name[msg], 0);
+ WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n",
+ virq, smp_ipi_name[msg], err);
+
+ return err;
+}
+
void smp_send_reschedule(int cpu)
{
if (likely(smp_ops))
@@ -408,8 +466,7 @@ out:
static struct device_node *cpu_to_l2cache(int cpu)
{
struct device_node *np;
- const phandle *php;
- phandle ph;
+ struct device_node *cache;
if (!cpu_present(cpu))
return NULL;
@@ -418,13 +475,11 @@ static struct device_node *cpu_to_l2cache(int cpu)
if (np == NULL)
return NULL;
- php = of_get_property(np, "l2-cache", NULL);
- if (php == NULL)
- return NULL;
- ph = *php;
+ cache = of_find_next_cache_node(np);
+
of_node_put(np);
- return of_find_node_by_phandle(ph);
+ return cache;
}
/* Activate a secondary processor. */