用户态接口

root@vm0:~# cat /sys/kernel/debug/irq/domains/DMAR-MSI
name:   DMAR-MSI
 size:   0
 mapped: 1
 flags:  0x00000013
 parent: VECTOR
    name:   VECTOR
     size:   0
     mapped: 41
     flags:  0x00000003
Online bitmaps:        8
Global available:   1580
Global reserved:      13
Total allocated:      28
System: 38: 0-19,32,50,128,236,240-242,244,246-255
     | CPU | avl | man | mac | act | vectors
         0   197     0     0    4  33-35,48
         1   197     0     0    4  33-36
         2   197     0     0    4  33-36
         3   197     0     0    4  33-36
         4   198     0     0    3  33-35
         5   198     0     0    3  33-35
         6   198     0     0    3  33-35
         7   198     0     0    3  33-35

数据结构

struct cpumap {
    unsigned int		available;
    unsigned int		allocated;
    unsigned int		managed;
    unsigned int		managed_allocated;
    bool			initialized;
    bool			online;
    unsigned long		alloc_map[IRQ_MATRIX_SIZE];
    unsigned long		managed_map[IRQ_MATRIX_SIZE];
};

struct irq_matrix {
    unsigned int		matrix_bits;
    unsigned int		alloc_start;
    unsigned int		alloc_end;
    unsigned int		alloc_size;
    unsigned int		global_available;
    unsigned int		global_reserved;
    unsigned int		systembits_inalloc;
    unsigned int		total_allocated;
    unsigned int		online_maps;
    struct cpumap __percpu	*maps;
    unsigned long		scratch_map[IRQ_MATRIX_SIZE];
    unsigned long		system_map[IRQ_MATRIX_SIZE];
};