/*      NetBSD: intr.c,v 1.15 2004/04/10 14:49:55 kochi Exp     */

/*
* Copyright 2002 (c) Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Frank van der Linden for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed for the NetBSD Project by
*      Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
*    or promote products derived from this software without specific prior
*    written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*     @(#)isa.c       7.2 (Berkeley) 5/13/91
*/
/*-
* Copyright (c) 1993, 1994 Charles Hannum.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*     This product includes software developed by the University of
*     California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*     @(#)isa.c       7.2 (Berkeley) 5/13/91
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pintr.c,v 1.24 2022/05/26 11:06:14 bouyer Exp $");

#include "opt_multiprocessor.h"
#include "opt_xen.h"
#include "isa.h"
#include "pci.h"
#include "opt_pci.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/cpu.h>

#include <uvm/uvm_extern.h>

#include <machine/i8259.h>
#include <machine/pio.h>
#include <xen/evtchn.h>
#include <xen/intr.h>

#include <dev/pci/pcivar.h>

#ifdef __HAVE_PCI_MSI_MSIX
#include <x86/pci/msipic.h>
#endif

#include "acpica.h"
#include "ioapic.h"
#include "opt_mpbios.h"

#if NIOAPIC > 0
/* XXX: todo - compat with lapic.c and XEN for x2apic */
bool x2apic_mode __read_mostly = false;
/* for x86/i8259.c */
struct intrstub legacy_stubs[NUM_LEGACY_IRQS] = {{0,0,0}};
/* for x86/ioapic.c */
struct intrstub ioapic_edge_stubs[MAX_INTR_SOURCES] = {{0,0,0}};
struct intrstub ioapic_level_stubs[MAX_INTR_SOURCES] = {{0,0,0}};
struct intrstub x2apic_edge_stubs[MAX_INTR_SOURCES] = {{0,0,0}};
struct intrstub x2apic_level_stubs[MAX_INTR_SOURCES] = {{0,0,0}};
#include <machine/i82093var.h>
#endif /* NIOAPIC */

// XXX NR_EVENT_CHANNELS is 2048, use some sparse structure?
short irq2port[NR_EVENT_CHANNELS] = {0}; /* actually port + 1, so that 0 is invaid */

#if NACPICA > 0
#include <machine/mpconfig.h>
#include <machine/mpacpi.h>
#endif
#ifdef MPBIOS
#include <machine/mpbiosvar.h>
#endif

#if NPCI > 0
#include <dev/pci/ppbreg.h>
#endif

#if defined(DOM0OPS) || NPCI > 0

#ifdef __HAVE_PCI_MSI_MSIX
int
xen_map_msi_pirq(struct pic *pic, int count)
{
       struct physdev_map_pirq map_irq;
       const struct msipic_pci_info *msi_i = msipic_get_pci_info(pic);
       int i;
       int ret;

       if (count == -1)
               count = msi_i->mp_veccnt;
       KASSERT(count > 0);

       KASSERT(pic->pic_type == PIC_MSI);

       memset(&map_irq, 0, sizeof(map_irq));
       map_irq.domid = DOMID_SELF;
       map_irq.type = MAP_PIRQ_TYPE_MSI_SEG;
       map_irq.index = -1;
       map_irq.pirq = -1;
       map_irq.bus = msi_i->mp_bus;
       map_irq.devfn = (msi_i->mp_dev << 3) | msi_i->mp_fun;
       aprint_debug("xen_map_msi_pirq bus %d devfn 0x%x (%d %d) entry_nr %d",
           map_irq.bus, map_irq.devfn, msi_i->mp_dev, msi_i->mp_fun,
           map_irq.entry_nr);
       map_irq.entry_nr = count;
       if (msi_i->mp_veccnt > 1) {
               map_irq.type = MAP_PIRQ_TYPE_MULTI_MSI;
       }

       ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);

       if (ret == 0) {
               KASSERT(map_irq.entry_nr == count);
               aprint_debug(" pirq(s)");
               for (i = 0; i < count; i++) {
                       msi_i->mp_xen_pirq[i] = map_irq.pirq + i;
                       aprint_debug(" %d", msi_i->mp_xen_pirq[i]);
               }
               aprint_debug("\n");
       } else {
               aprint_debug(" fail %d\n", ret);
       }
       return ret;
}

int
xen_map_msix_pirq(struct pic *pic, int count)
{
       struct physdev_map_pirq map_irq;
       const struct msipic_pci_info *msi_i = msipic_get_pci_info(pic);
       int i;
       int ret;

       if (count == -1)
               count = msi_i->mp_veccnt;
       KASSERT(count > 0);

       KASSERT(pic->pic_type == PIC_MSIX);

       memset(&map_irq, 0, sizeof(map_irq));
       map_irq.domid = DOMID_SELF;
       map_irq.type = MAP_PIRQ_TYPE_MSI_SEG;
       map_irq.index = -1;
       map_irq.pirq = -1;
       map_irq.bus = msi_i->mp_bus;
       map_irq.devfn = (msi_i->mp_dev << 3) | msi_i->mp_fun;
       map_irq.table_base = msi_i->mp_table_base;

       aprint_debug("xen_map_msix_pirq bus %d devfn 0x%x (%d %d) count %d",
           map_irq.bus, map_irq.devfn, msi_i->mp_dev, msi_i->mp_fun,
           count);

       for (i = 0; i < count; i++) {
               map_irq.entry_nr = i;
               map_irq.pirq = -1;
               aprint_debug(" map %d", i);
               ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
               if (ret) {
                       aprint_debug(" fail %d\n", ret);
                       goto fail;
               }
               msi_i->mp_xen_pirq[i] = map_irq.pirq;
               aprint_debug("->%d", msi_i->mp_xen_pirq[i]);
       }
       aprint_debug("\n");
       return 0;

fail:
       i--;
       while(i >= 0) {
               struct physdev_unmap_pirq unmap_irq;
               unmap_irq.domid = DOMID_SELF;
               unmap_irq.pirq = msi_i->mp_xen_pirq[i];

               (void)HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
               msi_i->mp_xen_pirq[i] = 0;
       }
       return ret;
}

void
xen_pci_msi_release(struct pic *pic, int count)
{
       const struct msipic_pci_info *msi_i = msipic_get_pci_info(pic);
       KASSERT(count == msi_i->mp_veccnt);
       for (int i = 0; i < count; i++) {
               struct physdev_unmap_pirq unmap_irq;
               unmap_irq.domid = DOMID_SELF;
               unmap_irq.pirq = msi_i->mp_xen_pirq[i];

               (void)HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
               msi_i->mp_xen_pirq[i] = 0;
       }
}

#endif /* __HAVE_PCI_MSI_MSIX */

/*
* This function doesn't "allocate" anything. It merely translates our
* understanding of PIC to the XEN 'gsi' namespace. In the case of
* MSIs, pirq == irq. In the case of everything else, the hypervisor
* doesn't really care, so we just use the native conventions that
* have been setup during boot by mpbios.c/mpacpi.c
*/
int
xen_pic_to_gsi(struct pic *pic, int pin)
{
       int ret;
       int gsi;

       KASSERT(pic != NULL);

       /*
        * We assume that mpbios/mpacpi have done the right thing.
        * If so, legacy_irq should identity map correctly to gsi.
        */
       gsi = pic->pic_vecbase + pin;
       KASSERT(gsi < NR_EVENT_CHANNELS);

       switch (pic->pic_type) {
       case PIC_I8259:
               KASSERT(gsi < 16);
               /* FALLTHROUGH */
       case PIC_IOAPIC:
           {
               KASSERT(gsi < 255);

               if (irq2port[gsi] != 0) {
                       /* Already mapped the shared interrupt */
                       break;
               }

               struct physdev_irq irq_op;
               memset(&irq_op, 0, sizeof(irq_op));
               irq_op.irq = gsi;
               ret = HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector,
                   &irq_op);
               if (ret < 0) {
                       panic("physdev_op(PHYSDEVOP_alloc_irq_vector) %d"
                           " fail %d", gsi, ret);
               }
               aprint_debug("xen_pic_to_gsi %s pin %d gsi %d allocated %d\n",
                   (pic->pic_type == PIC_IOAPIC) ? "ioapic" : "i8259",
                   pin, gsi, irq_op.vector);

               KASSERT(irq_op.vector == gsi);
               break;
           }
       case PIC_MSI:
       case PIC_MSIX:
#ifdef __HAVE_PCI_MSI_MSIX
       {
               const struct msipic_pci_info *msi_i = msipic_get_pci_info(pic);
               KASSERT(pin < msi_i->mp_veccnt);
               gsi = msi_i->mp_xen_pirq[pin];
               aprint_debug("xen_pic_to_gsi %s pin %d gsi %d\n",
                   (pic->pic_type == PIC_MSI) ? "MSI" : "MSIX",
                   pin, gsi);
               break;
       }
#endif
       default:
               panic("unknown pic_type %d", pic->pic_type);
               break;
       }

       return gsi;
}


#endif /* defined(DOM0OPS) || NPCI > 0 */

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