TRACE_IRQ_HANDLER_EN(9) IRQ TRACE_IRQ_HANDLER_EN(9)NAME
trace_irq_handler_entry - called immediately before the irq action handler
void trace_irq_handler_entry(int irq, struct irqaction * action);
pointer to struct irqaction
The struct irqaction pointed to by action contains various information about the handler, including the device name, action->name, and the
device id, action->dev_id. When used in conjunction with the irq_handler_exit tracepoint, we can figure out irq handler latencies.
Jason Baron <email@example.com>
William Cohen <firstname.lastname@example.org>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 TRACE_IRQ_HANDLER_EN(9)
Check Out this Related Man Page
REQUEST_THREADED_IRQ(9) Hardware Interfaces REQUEST_THREADED_IRQ(9)NAME
request_threaded_irq - allocate an interrupt line
int request_threaded_irq(unsigned int irq, irq_handler_t handler, irq_handler_t thread_fn, unsigned long irqflags, const char * devname,
void * dev_id);
Interrupt line to allocate
Function to be called when the IRQ occurs. Primary handler for threaded interrupts If NULL and thread_fn != NULL the default primary
handler is installed
Function called from the irq handler thread If NULL, no irq thread is created
Interrupt type flags
An ascii name for the claiming device
A cookie passed back to the handler function
This call allocates interrupt resources and enables the interrupt line and IRQ handling. From the point this call is made your handler
function may be invoked. Since your handler function must clear any interrupt the board raises, you must take care both to initialise your
hardware and to set up the interrupt handler in the right order.
If you want to set up a threaded irq handler for your device then you need to supply handler and thread_fn. handler ist still called in
hard interrupt context and has to check whether the interrupt originates from the device. If yes it needs to disable the interrupt on the
device and return IRQ_WAKE_THREAD which will wake up the handler thread and run thread_fn. This split handler design is necessary to
support shared interrupts.
Dev_id must be globally unique. Normally the address of the device data structure is used as the cookie. Since the handler receives this
value it makes sense to use it.
If your interrupt is shared you must pass a non NULL dev_id as this is required when freeing the interrupt.
IRQF_SHARED Interrupt is shared IRQF_DISABLED Disable local interrupts while processing IRQF_SAMPLE_RANDOM The interrupt can be used for
entropy IRQF_TRIGGER_* Specify active edge(s) or level
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 REQUEST_THREADED_IRQ(9)
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