• Stefano Stabellini's avatar
    xen: do not clear and mask evtchns in __xen_evtchn_do_upcall · 7e186bdd
    Stefano Stabellini authored
    Change the irq handler of evtchns and pirqs that don't need EOI (pirqs
    that correspond to physical edge interrupts) to handle_edge_irq.
    
    Use handle_fasteoi_irq for pirqs that need eoi (they generally
    correspond to level triggered irqs), no risk in loosing interrupts
    because we have to EOI the irq anyway.
    
    This change has the following benefits:
    
    - it uses the very same handlers that Linux would use on native for the
    same irqs (handle_edge_irq for edge irqs and msis, and
    handle_fasteoi_irq for everything else);
    
    - it uses these handlers in the same way native code would use them: it
    let Linux mask\unmask and ack the irq when Linux want to mask\unmask
    and ack the irq;
    
    - it fixes a problem occurring when a driver calls disable_irq() in its
    handler: the old code was unconditionally unmasking the evtchn even if
    the irq is disabled when irq_eoi was called.
    
    See Documentation/DocBook/genericirq.tmpl for more informations.
    Signed-off-by: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
    [v1: Fixed space/tab issues]
    Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    7e186bdd
events.c 38.4 KB