From 5b0c0572fcd6204675c5f7ddfa572b5017f817dd Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 8 Feb 2006 02:53:50 -0800 Subject: [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 --- arch/sparc64/kernel/irq.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'arch/sparc64/kernel/irq.c') 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 @@ static void __cpuinit init_one_mondo(unsigned long *pa_ptr, unsigned long type) } } -/* 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 @@ void __cpuinit sun4v_init_mondo_queues(void) 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. */ -- cgit v1.1