xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[SPARC64]: Sun4v interrupt handling.

Browse Source 
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>
This commit is contained in:
David S. Miller
2006-02-08 02:53:50 -08:00
parent ac29c11d4c
commit 5b0c0572fc
6 changed files with 568 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
arch/sparc64/kernel/irq.c
View File

@@ -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. */