/*      $OpenBSD: xspd.c,v 1.7 2022/03/11 18:00:52 mpi Exp $    */

/*
 * Copyright (c) 2015 Mike Belopuhov
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "xen.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/atomic.h>
#include <sys/device.h>
#include <sys/task.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>

#include <machine/i82093var.h>

#include <dev/pv/xenreg.h>
#include <dev/pv/xenvar.h>

struct xspd_softc {
        struct device           sc_dev;
        void *                  sc_ih;
};

int     xspd_match(struct device *, void *, void *);
void    xspd_attach(struct device *, struct device *, void *);
int     xspd_intr(void *);

struct cfdriver xspd_cd = {
        NULL, "xspd", DV_DULL
};

const struct cfattach xspd_ca = {
        sizeof(struct xspd_softc), xspd_match, xspd_attach, NULL, NULL
};

const struct pci_matchid xspd_devices[] = {
        { PCI_VENDOR_XENSOURCE, PCI_PRODUCT_XENSOURCE_PLATFORMDEV }
};

int
xspd_match(struct device *parent, void *match, void *aux)
{
        return (pci_matchbyid(aux, xspd_devices, nitems(xspd_devices)));
}

#if NXEN > 0
void
xspd_attach(struct device *parent, struct device *self, void *aux)
{
        struct pci_attach_args *pa = (struct pci_attach_args *)aux;
        struct xspd_softc *sc = (struct xspd_softc *)self;
        const char *intrstr = NULL;
        pci_intr_handle_t ih;
        struct xen_hvm_param xhp;
        extern struct xen_softc *xen_sc;

        if (xen_sc == NULL || (xen_sc->sc_flags & XSF_CBVEC)) {
                printf("\n");
                return;
        }

        if (pci_intr_map(pa, &ih) != 0) {
                printf(": couldn't map interrupt\n");
                return;
        }

        intrstr = pci_intr_string(pa->pa_pc, ih);
        sc->sc_ih = pci_intr_establish(pa->pa_pc, ih, IPL_NET | IPL_MPSAFE,
            xspd_intr, sc, sc->sc_dev.dv_xname);
        if (sc->sc_ih == NULL) {
                printf(": couldn't establish interrupt");
                if (intrstr != NULL)
                        printf(" at %s", intrstr);
                printf("\n");
                return;
        }
        printf(": %s\n", intrstr);

        xhp.domid = DOMID_SELF;
        xhp.index = HVM_PARAM_CALLBACK_IRQ;

        if (ih.line & APIC_INT_VIA_APIC)
                xhp.value = HVM_CALLBACK_PCI_INTX(pa->pa_device,
                    pa->pa_intrpin - 1);
        else
                xhp.value = HVM_CALLBACK_GSI(pci_intr_line(pa->pa_pc, ih));

        if (xen_hypercall(xen_sc, XC_HVM, 2, HVMOP_set_param, &xhp)) {
                printf("%s: failed to register callback PCI vector\n",
                    sc->sc_dev.dv_xname);
                pci_intr_disestablish(pa->pa_pc, sc->sc_ih);
                return;
        }

        xen_sc->sc_flags |= XSF_CBVEC;
}

int
xspd_intr(void *arg)
{
        xen_intr();

        return (1);
}
#else
void
xspd_attach(struct device *parent, struct device *self, void *aux)
{
        printf("\n");
}
#endif  /* NXEN > 0 */