Re: ioapic: adaption required?

[Christoph Egger <Christoph_Egger%gmx.de@localhost>]

On Monday 08 October 2007 13:33:38 Manuel Bouyer wrote:
> On Mon, Oct 08, 2007 at 01:22:32PM +0200, Christoph Egger wrote:
> > > xen/include/i82093var.h Or maybe you mean to use APIC operations to
> > > query/ack the interrupts instead of these hypercalls ?
> >
> > I'm talking about the hypercall used in pirq_establish() in xen/evtchn.c.
>
> Do you know what should be used instead now ?

The information is in  include/xen3-public/physdev.h.

To acknowledge an interrupt use:

/*
 * Notify end-of-interrupt (EOI) for the specified IRQ.
 * @arg == pointer to physdev_eoi structure.
 */
#define PHYSDEVOP_eoi                   12
struct physdev_eoi {
    /* IN */
    uint32_t irq;
};

To query for an interrupt use:

/*
 * Query the status of an IRQ line.
 * @arg == pointer to physdev_irq_status_query structure.
 */
#define PHYSDEVOP_irq_status_query       5
struct physdev_irq_status_query {
    /* IN */
    uint32_t irq;
    /* OUT */
    uint32_t flags; /* XENIRQSTAT_* */
};

/* Need to call PHYSDEVOP_eoi when the IRQ has been serviced? */
#define _XENIRQSTAT_needs_eoi   (0)
#define  XENIRQSTAT_needs_eoi   (1U<<_XENIRQSTAT_needs_eoi)

/* IRQ shared by multiple guests? */
#define _XENIRQSTAT_shared      (1)
#define  XENIRQSTAT_shared      (1U<<_XENIRQSTAT_shared)

To set VCPU's iopl use:

/*
 * Set the current VCPU's I/O privilege level.
 * @arg == pointer to physdev_set_iopl structure.
 */
#define PHYSDEVOP_set_iopl               6
struct physdev_set_iopl {
    /* IN */
    uint32_t iopl;
};

To allocate/free an interrupt use:

/*
 * Allocate or free a physical upcall vector for the specified IRQ line.
 * @arg == pointer to physdev_irq structure.
 */
#define PHYSDEVOP_alloc_irq_vector      10
#define PHYSDEVOP_free_irq_vector       11
struct physdev_irq {
    /* IN */
    uint32_t irq;
    /* IN or OUT */
    uint32_t vector;
};


The new physdev_op collects all these structs in an union:


struct physdev_op {
    uint32_t cmd;
    union {
        struct physdev_irq_status_query      irq_status_query;
        struct physdev_set_iopl              set_iopl;
        struct physdev_set_iobitmap          set_iobitmap;
        struct physdev_apic                  apic_op;
        struct physdev_irq                   irq_op;
    } u;
};

So, fill out the structure, set cmd to one of the above's #define,
then do the hypercall.