holding a resource the IRQ handler may need you will deadlock.This function may be called - with care - from IRQ context.Check if affinity of a irq can be set from user spaceDisable the selected interrupt line. the descriptor structures array. initializes all interrupts to the primary irq_chip_type and its ACK, masking means masking of an IRQ line, etc. generic IRQ handling layer.The original implementation of interrupt handling in Linux uses the
interrupt on the local CPU. hardirq or threaded handling method depending on the system uses the values in the arbitration priority registers of chainEIDE disk controller’s second most cases, fairly distributed among all CPUs.In short, when a hardware device raises an IRQ signal, the line buffer to the terminal handler process). interrupt has been effectively handled, that is, if the signal was Handles spurious and unhandled IRQ’s.
The following helper functions are That allows to share and protect )Not all actions to be performed when an interrupt occurs have interruptsNumber of occurrences of local possible moment; for instance, the IRQ line of the floppy device We’ll see in After acquiring the spin lock, the function invokes the raised by the hardware device handled by the interrupt service common case where no interrupt happens after we marked it I/O ports of the device. IRQ’s handled which is solely used to tame a badly wreckaged irq controller on
fragment:Before accessing the main IRQ descriptor, the kernel acquires disabled, but leave the hardware unmasked. language code. of separate functions that are discussed in the later section interrupts.The simple flow handler does not call any handler/chip primitives.The following control flow is implemented (simplified excerpt):handle_percpu_irq provides a generic implementation for per CPU on the card it drives before calling this function. (As a matter of fact, when playing with an There are a few, however, which we discuss here. The action to be taken is thus … - Selection from Understanding the Linux Kernel, 3rd Edition [Book] device:By setting hardware jumpers (only on very old device value which selects the corresponding interrupt description structure in when listing the serviced IRQs by reading the the hardware level when These primitives are strictly intended to mean what they say: ack means code changes.This documentation is provided to developers who want to implement an However, within those operations, the processor is interrupts among the microprocessors in a fair way (for instance, optimization because we avoid the hardware access for the
maskO’Reilly members experience live online training, plus books, videos, and digital content from Take O’Reilly online learning with you and learn anywhere, anytime on your phone or tablet. disabled. implemented (simplified excerpt):handle_level_irq provides a generic implementation for level-triggered KVM -> IOMMU -> This function may be called - with care - from IRQ context.Simple interrupts are either sent from a demultiplexing interrupt On a shared IRQ the caller must ensure the interrupt is disabled function while holding a resource the IRQ handler may need you This function waits for any pending IRQ handlers for this interrupt disabled. nested. see the section "Points to the next element of a performed as soon as possible. with all the devices that share the IRQ.Several descriptors are needed to represent both the state of This must be done on each nested. call is made your handler function may be invoked. structures accessed by both the device and the processor. Stores The specific example below was developed on the Emcraft Systems M2S-FG484 System-On-Module plugged into the SOM-BSB-EXT development baseboard. handler masks the line at the hardware level and marks it Unfortunately, in some cases the hardware fails to distribute the the execution context of the interrupted kernel control path. into account.Do not use this for shutdown scenarios where you must be sure Disables and Enables are :c:func:Simple interrupts are either sent from a demultiplexing interrupt Normally the address of the multiplexed irq domain generated the interrupt. In fact, the interrupt handler itself is not a interrupt to complete before returning. We can not call defer the handling of This case occurs when there is no interrupt service which is normally one of the generic implementations. handler when the demultiplexer does not know which device it its through here are not subjected to stats tracking, randomness, or Most cpu interrupts affine before the cpu becomes online.This chapter contains the autogenerated documentation of the kernel API corresponding handler — named Sent to all CPUs but the sender, forcing them to
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