69138e8788
Devices that use ISA IRQs expect them to be already configured, and don't call bus_config_intr, which prevents those IRQs from working on Xen. In order to solve it pre-register all the legacy IRQs with the default values (edge triggered, low polarity) if no override is found. While there add a panic if the registration of an interrupt override fails. Sponsored by: Citrix Systems R&D
253 lines
6.3 KiB
C
253 lines
6.3 KiB
C
/*-
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* Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
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* Copyright (c) 2013 Roger Pau Monné <roger.pau@citrix.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/smp.h>
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#include <sys/pcpu.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/intr_machdep.h>
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#include <x86/apicvar.h>
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#include <machine/cpu.h>
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#include <machine/smp.h>
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#include <xen/xen-os.h>
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#include <xen/xen_intr.h>
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#include <xen/hypervisor.h>
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#include <xen/interface/vcpu.h>
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/actables.h>
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#include <dev/acpica/acpivar.h>
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static int xenpv_probe(void);
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static int xenpv_probe_cpus(void);
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static int xenpv_setup_local(void);
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static int xenpv_setup_io(void);
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static ACPI_TABLE_MADT *madt;
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static vm_paddr_t madt_physaddr;
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static vm_offset_t madt_length;
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static struct apic_enumerator xenpv_enumerator = {
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"Xen PV",
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xenpv_probe,
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xenpv_probe_cpus,
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xenpv_setup_local,
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xenpv_setup_io
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};
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/*--------------------- Helper functions to parse MADT -----------------------*/
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/*
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* Parse an interrupt source override for an ISA interrupt.
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*/
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static void
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madt_parse_interrupt_override(ACPI_MADT_INTERRUPT_OVERRIDE *intr)
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{
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enum intr_trigger trig;
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enum intr_polarity pol;
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int ret;
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if (acpi_quirks & ACPI_Q_MADT_IRQ0 && intr->SourceIrq == 0 &&
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intr->GlobalIrq == 2) {
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if (bootverbose)
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printf("MADT: Skipping timer override\n");
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return;
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}
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madt_parse_interrupt_values(intr, &trig, &pol);
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/* Remap the IRQ if it is mapped to a different interrupt vector. */
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if (intr->SourceIrq != intr->GlobalIrq && intr->GlobalIrq > 15 &&
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intr->SourceIrq == AcpiGbl_FADT.SciInterrupt)
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/*
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* If the SCI is remapped to a non-ISA global interrupt,
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* then override the vector we use to setup.
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*/
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acpi_OverrideInterruptLevel(intr->GlobalIrq);
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/* Register the IRQ with the polarity and trigger mode found. */
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ret = xen_register_pirq(intr->GlobalIrq, trig, pol);
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if (ret != 0)
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panic("Unable to register interrupt override");
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}
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/*
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* Call the handler routine for each entry in the MADT table.
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*/
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static void
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madt_walk_table(acpi_subtable_handler *handler, void *arg)
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{
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acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length,
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handler, arg);
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}
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/*
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* Parse interrupt entries.
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*/
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static void
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madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, void *arg __unused)
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{
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if (entry->Type == ACPI_MADT_TYPE_INTERRUPT_OVERRIDE)
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madt_parse_interrupt_override(
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(ACPI_MADT_INTERRUPT_OVERRIDE *)entry);
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}
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/*---------------------------- Xen PV enumerator -----------------------------*/
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/*
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* This enumerator will only be registered on PVH
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*/
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static int
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xenpv_probe(void)
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{
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return (0);
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}
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/*
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* Test each possible vCPU in order to find the number of vCPUs
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*/
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static int
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xenpv_probe_cpus(void)
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{
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#ifdef SMP
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int i, ret;
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for (i = 0; i < MAXCPU; i++) {
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ret = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
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if (ret >= 0)
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lapic_create((i * 2), (i == 0));
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}
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#endif
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return (0);
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}
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/*
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* Initialize the vCPU id of the BSP
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*/
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static int
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xenpv_setup_local(void)
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{
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PCPU_SET(vcpu_id, 0);
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lapic_init(0);
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return (0);
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}
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/*
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* On PVH guests there's no IO APIC
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*/
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static int
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xenpv_setup_io(void)
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{
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if (xen_initial_domain()) {
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int i, ret;
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/* Map MADT */
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madt_physaddr = acpi_find_table(ACPI_SIG_MADT);
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madt = acpi_map_table(madt_physaddr, ACPI_SIG_MADT);
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madt_length = madt->Header.Length;
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/* Try to initialize ACPI so that we can access the FADT. */
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i = acpi_Startup();
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if (ACPI_FAILURE(i)) {
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printf("MADT: ACPI Startup failed with %s\n",
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AcpiFormatException(i));
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printf("Try disabling either ACPI or apic support.\n");
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panic("Using MADT but ACPI doesn't work");
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}
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/* Run through the table to see if there are any overrides. */
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madt_walk_table(madt_parse_ints, NULL);
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/*
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* If there was not an explicit override entry for the SCI,
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* force it to use level trigger and active-low polarity.
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*/
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if (!madt_found_sci_override) {
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printf(
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"MADT: Forcing active-low polarity and level trigger for SCI\n");
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ret = xen_register_pirq(AcpiGbl_FADT.SciInterrupt,
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INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
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if (ret != 0)
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panic("Unable to register SCI IRQ");
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}
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/* Register legacy ISA IRQs */
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for (i = 1; i < 16; i++) {
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if (intr_lookup_source(i) != NULL)
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continue;
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ret = xen_register_pirq(i, INTR_TRIGGER_EDGE,
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INTR_POLARITY_LOW);
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if (ret != 0 && bootverbose)
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printf("Unable to register legacy IRQ#%d: %d\n",
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i, ret);
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}
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acpi_SetDefaultIntrModel(ACPI_INTR_APIC);
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}
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return (0);
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}
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static void
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xenpv_register(void *dummy __unused)
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{
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if (xen_pv_domain()) {
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apic_register_enumerator(&xenpv_enumerator);
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}
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}
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SYSINIT(xenpv_register, SI_SUB_TUNABLES - 1, SI_ORDER_FIRST, xenpv_register, NULL);
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/*
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* Setup per-CPU vCPU IDs
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*/
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static void
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xenpv_set_ids(void *dummy)
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{
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struct pcpu *pc;
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int i;
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CPU_FOREACH(i) {
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pc = pcpu_find(i);
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pc->pc_vcpu_id = i;
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}
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}
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SYSINIT(xenpv_set_ids, SI_SUB_CPU, SI_ORDER_MIDDLE, xenpv_set_ids, NULL);
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