[SPARC64]: Sun4v interrupt handling.
Sun4v has 4 interrupt queues: cpu, device, resumable errors,
and non-resumable errors. A set of head/tail offset pointers
help maintain a work queue in physical memory. The entries
are 64-bytes in size.
Each queue is allocated then registered with the hypervisor
as we bring cpus up.
The two error queues each get a kernel side buffer that we
use to quickly empty the main interrupt queue before we
call up to C code to log the event and possibly take evasive
action.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index 3c1a213..ff201c0 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -888,7 +888,19 @@
}
}
-/* Allocate and init the mondo queues for this cpu. */
+static void __cpuinit init_one_kbuf(unsigned long *pa_ptr)
+{
+ unsigned long page = get_zeroed_page(GFP_ATOMIC);
+
+ if (!page) {
+ prom_printf("SUN4V: Error, cannot allocate kbuf page.\n");
+ prom_halt();
+ }
+
+ *pa_ptr = __pa(page);
+}
+
+/* Allocate and init the mondo and error queues for this cpu. */
void __cpuinit sun4v_init_mondo_queues(void)
{
int cpu = hard_smp_processor_id();
@@ -897,7 +909,9 @@
init_one_mondo(&tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO);
init_one_mondo(&tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO);
init_one_mondo(&tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR);
+ init_one_kbuf(&tb->resum_kernel_buf_pa);
init_one_mondo(&tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR);
+ init_one_kbuf(&tb->nonresum_kernel_buf_pa);
}
/* Only invoked on boot processor. */
