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/*-
* SPDX-License-Identifier: MIT OR GPL-2.0-only
*
* Copyright © 2013 Spectra Logic Corporation
* Copyright © 2018 John Baldwin/The FreeBSD Foundation
* Copyright © 2019 Roger Pau Monné/Citrix Systems R&D
* Copyright © 2021 Elliott Mitchell
*
* This file may be distributed separately from the Linux kernel, or
* incorporated into other software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/smp.h>
#include <sys/stddef.h>
#include <xen/xen-os.h>
#include <xen/xen_intr.h>
#include <x86/intr_machdep.h>
#include <x86/apicvar.h>
/************************ Xen x86 interrupt interface ************************/
/*
* Pointers to the interrupt counters
*/
DPCPU_DEFINE_STATIC(u_long *, pintrcnt);
static void
xen_intrcnt_init(void *dummy __unused)
{
unsigned int i;
if (!xen_domain())
return;
CPU_FOREACH(i) {
char buf[MAXCOMLEN + 1];
snprintf(buf, sizeof(buf), "cpu%d:xen", i);
intrcnt_add(buf, DPCPU_ID_PTR(i, pintrcnt));
}
}
SYSINIT(xen_intrcnt_init, SI_SUB_INTR, SI_ORDER_MIDDLE, xen_intrcnt_init, NULL);
/*
* Transition from assembly language, called from
* sys/{amd64/amd64|i386/i386}/apic_vector.S
*/
extern void xen_arch_intr_handle_upcall(struct trapframe *);
void
xen_arch_intr_handle_upcall(struct trapframe *trap_frame)
{
struct trapframe *old;
/*
* Disable preemption in order to always check and fire events
* on the right vCPU
*/
critical_enter();
++*DPCPU_GET(pintrcnt);
++curthread->td_intr_nesting_level;
old = curthread->td_intr_frame;
curthread->td_intr_frame = trap_frame;
xen_intr_handle_upcall(NULL);
curthread->td_intr_frame = old;
--curthread->td_intr_nesting_level;
if (xen_evtchn_needs_ack)
lapic_eoi();
critical_exit();
}
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