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kstat_intr(9s) [opensolaris man page]

kstat_intr(9S)						    Data Structures for Drivers 					    kstat_intr(9S)

NAME
kstat_intr - structure for interrupt kstats SYNOPSIS
#include <sys/types.h> #include <sys/kstat.h> #include <sys/ddi.h> #include <sys/sunddi.h> INTERFACE LEVEL
Solaris DDI specific (Solaris DDI) DESCRIPTION
Interrupt statistics are kept in the kstat_intr structure. When kstat_create(9F) creates an interrupt kstat, the ks_data field is a pointer to one of these structures. The macro KSTAT_INTR_PTR() is provided to retrieve this field. It looks like this: #define KSTAT_INTR_PTR(kptr) ((kstat_intr_t *)(kptr)->ks_data) An interrupt is a hard interrupt (sourced from the hardware device itself), a soft interrupt (induced by the system through the use of some system interrupt source), a watchdog interrupt (induced by a periodic timer call), spurious (an interrupt entry point was entered but there was no interrupt to service), or multiple service (an interrupt was detected and serviced just prior to returning from any of the other types). Drivers generally report only claimed hard interrupts and soft interrupts from their handlers, but measurement of the spurious class of interrupts is useful for auto-vectored devices in order to pinpoint any interrupt latency problems in a particular system configuration. Devices that have more than one interrupt of the same type should use multiple structures. STRUCTURE MEMBERS
ulong_t intrs[KSTAT_NUM_INTRS]; /* interrupt counters */ The only member exposed to drivers is the intrs member. This field is an array of counters. The driver must use the appropriate counter in the array based on the type of interrupt condition. The following indexes are supported: KSTAT_INTR_HARD Hard interrupt KSTAT_INTR_SOFT Soft interrupt KSTAT_INTR_WATCHDOG Watchdog interrupt KSTAT_INTR_SPURIOUS Spurious interrupt KSTAT_INTR_MULTSVC Multiple service interrupt SEE ALSO
kstat(9S) Writing Device Drivers SunOS 5.11 4 Apr 1994 kstat_intr(9S)

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ddi_intr_hilevel(9F)					   Kernel Functions for Drivers 				      ddi_intr_hilevel(9F)

NAME
ddi_intr_hilevel - indicate interrupt handler type SYNOPSIS
#include <sys/ddi.h> #include <sys/sunddi.h> int ddi_intr_hilevel(dev_info_t *dip, uint_t inumber); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). This interface is obsolete. Use the new interrupt interfaces referenced in Intro(9F). Refer to Writing Device Drivers for more information. PARAMETERS
dip Pointer to dev_info structure. inumber Interrupt number. DESCRIPTION
The ddi_intr_hilevel() function returns non-zero if the specified interrupt is a "high level" interrupt. High level interrupts must be handled without using system services that manipulate thread or process states, because these interrupts are not blocked by the scheduler. In addition, high level interrupt handlers must take care to do a minimum of work because they are not preemptable. A typical high level interrupt handler would put data into a circular buffer and schedule a soft interrupt by calling ddi_trigger_soft- intr(). The circular buffer could be protected by using a mutex that was properly initialized for the interrupt handler. The ddi_intr_hilevel() function can be used before calling ddi_add_intr() to decide which type of interrupt handler should be used. Most device drivers are designed with the knowledge that the devices they support will always generate low level interrupts, however some devices, for example those using SBus or VME bus level 6 or 7 interrupts must use this test because on some machines those interrupts are high level (above the scheduler level) and on other machines they are not. RETURN VALUES
non-zero indicates a high-level interrupt. CONTEXT
These functions can be called from useruser, interrupt, or kernel context. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Obsolete | +-----------------------------+-----------------------------+ SEE ALSO
ddi_add_intr(9F), Intro(9F), mutex(9F) Writing Device Drivers SunOS 5.11 16 Jan 2006 ddi_intr_hilevel(9F)
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