第一次張貼,所以請原諒任何愚蠢。爲什麼我不能在Linux 2.6.26中註冊邊沿觸發的中斷?
我正在爲從2.6.22到2.6.26爲MPC83xx構建的Linux內核上移植定製CPLD驅動程序,並且正在接收意外的Oops。該驅動程序對.22內核工作正常,但在我對request_irq的調用中,.26內核窒息。有人知道爲什麼行爲發生了變化,或者更好,我需要做些什麼來解決它?
我的哎呀來源追查到調用內核/ IRQ/manage.c,其中desc->chip->enable(irq)
被稱爲setup_irq()
,它看起來像函數指針,以使在以ipic_set_irq_type()
通話被清除在arch/powerpc/sysdev/ipic.c中。不幸的是,我不知道爲什麼。
我已經包含Oops和複製問題的示例內核模塊。
哎呀 -
Unable to handle kernel paging request for instruction fetch
Faulting instruction address: 0x00000000
Oops: Kernel access of bad area, sig: 11 [#1]
PREEMPT SCPA-G2
Modules linked in: cpld(+)
NIP: 00000000 LR: c004b930 CTR: 00000000
REGS: df8b5df0 TRAP: 0400 Not tainted (2.6.26-twacs-100.0.0)
MSR: 20001032 <ME,IR,DR> CR: 24022422 XER: 20000000
TASK = dfbcfc00[488] 'insmod' THREAD: df8b4000
GPR00: 00000000 df8b5ea0 dfbcfc00 00000017 00000001 00000001 00000000 c02d1fb4
GPR08: 00002268 00000000 00000000 00000000 44022484 10073f68 1ffcb000 007ffeb0
GPR16: 00000000 00000000 00800000 00000000 bffff7f0 00000000 1006e3dc 00000000
GPR24: 00000002 00000000 00000000 00009032 df9d04c0 00000017 df8b4000 c02d40e4
NIP [00000000] 0x0
LR [c004b930] setup_irq+0x404/0x430
Call Trace:
[df8b5ea0] [c004b8ec] setup_irq+0x3c0/0x430 (unreliable)
[df8b5ed0] [c004bbd8] request_irq+0xe0/0x130
[df8b5f00] [e1078054] cpld_init+0x54/0xd0 [cpld]
[df8b5f10] [c0048ba0] sys_init_module+0x14c/0x1d8
[df8b5f40] [c0010008] ret_from_syscall+0x0/0x38
--- Exception: c01 at 0xff27bb0
LR = 0x10019ca8
Instruction dump:
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
Kernel panic - not syncing: Fatal exception
模塊 -
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
static unsigned int cpld_virq = NO_IRQ;
unsigned value = 0xdeadbeef;
static irqreturn_t cpld_isr(int irq, void *dev_id) {
return IRQ_HANDLED;
}
void __exit cpld_cleanup(void) {
free_irq(cpld_interrupt, &value);
irq_dispose_mapping(cpld_virq);
return;
}
int __init cpld_init(void) {
int retval;
unsigned long cpld_interrupt = 23;
cpld_virq = irq_create_mapping(NULL, cpld_interrupt);
if (cpld_virq == NO_IRQ) {
return -EBUSY;
}
retval = request_irq(cpld_virq, cpld_isr,
IRQF_DISABLED | IRQF_SHARED | IRQF_TRIGGER_FALLING,
"CPLD", &value);
if (retval) {
irq_dispose_mapping(cpld_virq);
return retval;
}
return 0;
}
module_init(cpld_init);
module_exit(cpld_cleanup);
MODULE_LICENSE("Dual BSD/GPL");
感謝您的幫助。我已經打了好幾天了,並且歡迎提供任何建議。
它看起來特定於邊緣觸發的IRQ。級別觸發的外部IRQ不會導致Oops。也許我錯過了一些額外的設置? – Sam 2010-04-12 21:18:14