e13507f6f0
Just allow MSI interrupts to always start at the end of the I/O APIC pins. Since existing machines already have more than 255 I/O APIC pins, IRQ 255 is no longer reliably invalid, so just remove the minimum starting value for MSI. Reviewed by: kib, markj Differential Revision: https://reviews.freebsd.org/D17991
134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
/*
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* Copyright (c) 2014 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/bus.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/sx.h>
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#include <sys/systm.h>
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#include <x86/apicreg.h>
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#include <machine/cputypes.h>
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#include <machine/md_var.h>
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#include <machine/frame.h>
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#include <machine/intr_machdep.h>
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#include <x86/apicvar.h>
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#include <machine/specialreg.h>
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#include <dev/pci/pcivar.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/xen_msi.h>
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static struct mtx msi_lock;
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static u_int msi_last_irq;
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void
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xen_msi_init(void)
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{
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MPASS(num_io_irqs > 0);
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first_msi_irq = num_io_irqs;
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if (num_msi_irqs > UINT_MAX - first_msi_irq)
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panic("num_msi_irq too high");
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num_io_irqs = first_msi_irq + num_msi_irqs;
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mtx_init(&msi_lock, "msi", NULL, MTX_DEF);
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}
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/*
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* Try to allocate 'count' interrupt sources with contiguous IDT values.
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*/
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int
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xen_msi_alloc(device_t dev, int count, int maxcount, int *irqs)
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{
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int i, ret = 0;
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mtx_lock(&msi_lock);
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/* If we would exceed the max, give up. */
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if (msi_last_irq + count > num_msi_irqs) {
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mtx_unlock(&msi_lock);
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return (ENXIO);
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}
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/* Allocate MSI vectors */
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for (i = 0; i < count; i++)
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irqs[i] = first_msi_irq + msi_last_irq++;
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mtx_unlock(&msi_lock);
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ret = xen_register_msi(dev, irqs[0], count);
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if (ret != 0)
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return (ret);
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for (i = 0; i < count; i++)
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nexus_add_irq(irqs[i]);
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return (0);
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}
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int
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xen_msi_release(int *irqs, int count)
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{
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int i, ret;
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for (i = 0; i < count; i++) {
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ret = xen_release_msi(irqs[i]);
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if (ret != 0)
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return (ret);
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}
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return (0);
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}
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int
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xen_msi_map(int irq, uint64_t *addr, uint32_t *data)
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{
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return (0);
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}
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int
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xen_msix_alloc(device_t dev, int *irq)
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{
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return (ENXIO);
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}
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int
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xen_msix_release(int irq)
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{
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return (ENOENT);
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}
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