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Hi ALL,
Following code is not generating interrupts on my Debian system, instead below message erupts on interrupt generation.
do_IRQ: 3.59 No irq handler for vector (irq -1)
My Debian machine has 3.16.51-2 Linux kernel.
Can any one help me to understand the behavior and fix?
ideally the program should generate interrupt IRQ11 when device file is read using sudo cat /dev/etx_Dev
the same program is running on Debian 9 which has newer kernel version 4.9.x with proper irq handling.
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kdev_t.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include<linux/slab.h>
#include<linux/uaccess.h>
#include<linux/sysfs.h>
#include<linux/kobject.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#define IRQ_NO 11
//Interrupt handler for IRQ 11.
static irqreturn_t irq_handler(int irq,void *dev_id) {
printk(KERN_ERR "Shared IRQ: Interrupt Occurred");
return IRQ_HANDLED;
}
volatile int etx_value = 0;
dev_t dev = 0;
static struct class *dev_class;
static struct cdev etx_cdev;
struct kobject *kobj_ref;
static int __init etx_driver_init(void);
static void __exit etx_driver_exit(void);
/*************** Driver Fuctions **********************/
static int etx_open(struct inode *inode, struct file *file);
static int etx_release(struct inode *inode, struct file *file);
static ssize_t etx_read(struct file *filp,
char __user *buf, size_t len,loff_t * off);
static ssize_t etx_write(struct file *filp,
const char *buf, size_t len, loff_t * off);
/*************** Sysfs Fuctions **********************/
static ssize_t sysfs_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf);
static ssize_t sysfs_store(struct kobject *kobj,
struct kobj_attribute *attr,const char *buf, size_t count);
struct kobj_attribute etx_attr = __ATTR(etx_value, 0660, sysfs_show, sysfs_store);
static struct file_operations fops =
{
.owner = THIS_MODULE,
.read = etx_read,
.write = etx_write,
.open = etx_open,
.release = etx_release,
};
static ssize_t sysfs_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
printk(KERN_ERR "Sysfs - Read!!!\n");
return sprintf(buf, "%d", etx_value);
}
static ssize_t sysfs_store(struct kobject *kobj,
struct kobj_attribute *attr,const char *buf, size_t count)
{
printk(KERN_ERR "Sysfs - Write!!!\n");
sscanf(buf,"%d",&etx_value);
return count;
}
static int etx_open(struct inode *inode, struct file *file)
{
printk(KERN_ERR "Device File Opened...!!!\n");
return 0;
}
static int etx_release(struct inode *inode, struct file *file)
{
printk(KERN_ERR "Device File Closed...!!!\n");
return 0;
}
static ssize_t etx_read(struct file *filp,
char __user *buf, size_t len, loff_t *off)
{
printk(KERN_ERR "Read function\n");
asm("int $0x3B"); // Corresponding to irq 11
return 0;
}
static ssize_t etx_write(struct file *filp,
const char __user *buf, size_t len, loff_t *off)
{
printk(KERN_ERR "Write Function\n");
return 0;
}
static int __init etx_driver_init(void)
{
printk(KERN_ERR "my_device: in etx_driver_init... ");
/*Allocating Major number*/
if((alloc_chrdev_region(&dev, 0, 1, "etx_Dev")) <0){
printk(KERN_ERR "Cannot allocate major number\n");
return -1;
}
printk(KERN_ERR "Major = %d Minor = %d \n",MAJOR(dev), MINOR(dev));
/*Creating cdev structure*/
cdev_init(&etx_cdev,&fops);
/*Adding character device to the system*/
if((cdev_add(&etx_cdev,dev,1)) < 0){
printk(KERN_ERR "Cannot add the device to the system\n");
goto r_class;
}
/*Creating struct class*/
if((dev_class = class_create(THIS_MODULE,"etx_class")) == NULL){
printk(KERN_ERR "Cannot create the struct class\n");
goto r_class;
}
/*Creating device*/
if((device_create(dev_class,NULL,dev,NULL,"etx_device")) == NULL){
printk(KERN_ERR "Cannot create the Device 1\n");
goto r_device;
}
/*Creating a directory in /sys/kernel/ */
kobj_ref = kobject_create_and_add("etx_sysfs",kernel_kobj);
/*Creating sysfs file for etx_value*/
if(sysfs_create_file(kobj_ref,&etx_attr.attr)){
printk(KERN_ERR"Cannot create sysfs file......\n");
goto r_sysfs;
}
printk(KERN_ERR "my_device: calling request_irq... ");
if (request_irq(IRQ_NO, irq_handler, IRQF_SHARED, "etx_device", (void *)(irq_handler))) {
printk(KERN_ERR "my_device: cannot register IRQ ");
goto irq;
}
printk(KERN_ERR "Device Driver Insert...Done!!!\n");
return 0;
irq:
free_irq(IRQ_NO,(void *)(irq_handler));
r_sysfs:
kobject_put(kobj_ref);
sysfs_remove_file(kernel_kobj, &etx_attr.attr);
r_device:
class_destroy(dev_class);
r_class:
unregister_chrdev_region(dev,1);
cdev_del(&etx_cdev);
return -1;
}
void __exit etx_driver_exit(void)
{
free_irq(IRQ_NO,(void *)(irq_handler));
kobject_put(kobj_ref);
sysfs_remove_file(kernel_kobj, &etx_attr.attr);
device_destroy(dev_class,dev);
class_destroy(dev_class);
cdev_del(&etx_cdev);
unregister_chrdev_region(dev, 1);
printk(KERN_ERR "Device Driver Remove...Done!!!\n");
}
module_init(etx_driver_init);
module_exit(etx_driver_exit);[email protected]:/home/ravi/cprog/>cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 23 0 0 0 IR-IO-APIC-edge timer
1: 3568 0 0 0 IR-IO-APIC-edge i8042
8: 1 0 0 0 IR-IO-APIC-edge rtc0
9: 53291962 0 0 0 IR-IO-APIC-fasteoi acpi
11: 0 0 0 0 IR-IO-APIC-edge etx_device
12: 111320 0 0 0 IR-IO-APIC-edge i8042
16: 33 0 0 0 IR-IO-APIC-fasteoi ehci_hcd:usb3
17: 11 0 0 0 IR-IO-APIC-fasteoi
18: 0 0 0 0 IR-IO-APIC-fasteoi ata_generic, i801_smbus
19: 2 0 0 0 IR-IO-APIC-fasteoi firewire_ohci
20: 429103 0 0 0 IR-IO-APIC-fasteoi eth0
23: 35 0 0 0 IR-IO-APIC-fasteoi ehci_hcd:usb4
36: 980 0 0 0 IR-IO-APIC-fasteoi snd_hda_intel
64: 0 0 0 0 DMAR_MSI-edge dmar0
65: 416536 0 0 0 IR-PCI-MSI-edge eth1
66: 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
67: 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
68: 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
69: 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
70: 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
71: 1 0 0 0 IR-PCI-MSI-edge isci-msix
72: 0 0 0 0 IR-PCI-MSI-edge isci-msix
73: 68826 0 0 0 IR-PCI-MSI-edge ahci
74: 2 0 0 0 IR-PCI-MSI-edge ioat-msix
75: 2 0 0 0 IR-PCI-MSI-edge ioat-msix
76: 2 0 0 0 IR-PCI-MSI-edge ioat-msix
77: 2 0 0 0 IR-PCI-MSI-edge ioat-msix
78: 2 0 0 0 IR-PCI-MSI-edge ioat-msix
79: 2 0 0 0 IR-PCI-MSI-edge ioat-msix
80: 2 0 0 0 IR-PCI-MSI-edge ioat-msix
81: 2 0 0 0 IR-PCI-MSI-edge ioat-msix
82: 24 0 0 0 IR-PCI-MSI-edge mei_me
83: 173557 0 0 0 IR-PCI-MSI-edge nouveau
84: 339 0 0 0 IR-PCI-MSI-edge snd_hda_intel
NMI: 284 17 18 18 Non-maskable interrupts
LOC: 782976 574541 745413 563495 Local timer interrupts
SPU: 0 0 0 0 Spurious interrupts
PMI: 284 17 18 18 Performance monitoring interrupts
IWI: 1 0 0 0 IRQ work interrupts
RTR: 0 0 0 0 APIC ICR read retries
RES: 23038 6172 8407 5291 Rescheduling interrupts
CAL: 1318 37438 39630 45364 Function call interrupts
TLB: 1703 466 604 436 TLB shootdowns
TRM: 0 0 0 0 Thermal event interrupts
THR: 0 0 0 0 Threshold APIC interrupts
MCE: 0 0 0 0 Machine check exceptions
MCP: 11 11 11 11 Machine check polls
HYP: 0 0 0 0 Hypervisor callback interrupts
ERR: 0
MIS: 0Edit: Added code tags.
Last edited by i3839 (2018-10-17 07:49 PM)
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What is your dmesg output? And is this a real machine or a virtual machine?
Maybe the IRQ API changed between kernel 3 and 4.
Or it is not actually the kernel version difference that matters, but the hardware you are testing on.
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