1/* 2 * Copyright (c) 2014 Roger Pau Monn�� <roger.pau@citrix.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30#include <sys/param.h> 31#include <sys/bus.h> 32#include <sys/kernel.h> 33#include <sys/limits.h> 34#include <sys/lock.h> 35#include <sys/malloc.h> 36#include <sys/mutex.h> 37#include <sys/sx.h> 38#include <sys/systm.h> 39#include <x86/apicreg.h> 40#include <machine/cputypes.h> 41#include <machine/md_var.h> 42#include <machine/frame.h> 43#include <machine/intr_machdep.h> 44#include <x86/apicvar.h> 45#include <machine/specialreg.h> 46#include <dev/pci/pcivar.h> 47 48#include <xen/xen-os.h> 49#include <xen/xen_intr.h> 50#include <xen/xen_msi.h> 51 52static struct mtx msi_lock; 53static u_int msi_last_irq; 54 55void 56xen_msi_init(void) 57{ 58 59 MPASS(num_io_irqs > 0); 60 first_msi_irq = num_io_irqs; 61 if (num_msi_irqs > UINT_MAX - first_msi_irq) 62 panic("num_msi_irqs too high"); 63 num_io_irqs = first_msi_irq + num_msi_irqs; 64 65 mtx_init(&msi_lock, "msi", NULL, MTX_DEF); 66} 67 68/* 69 * Try to allocate 'count' interrupt sources with contiguous IDT values. 70 */ 71int 72xen_msi_alloc(device_t dev, int count, int maxcount, int *irqs) 73{ 74 int i, ret = 0; 75 76 mtx_lock(&msi_lock); 77 78 /* If we would exceed the max, give up. */ 79 if (msi_last_irq + count > num_msi_irqs) { 80 mtx_unlock(&msi_lock); 81 return (ENXIO); 82 } 83 84 /* Allocate MSI vectors */ 85 for (i = 0; i < count; i++) 86 irqs[i] = first_msi_irq + msi_last_irq++; 87 88 mtx_unlock(&msi_lock); 89 90 ret = xen_register_msi(dev, irqs[0], count); 91 if (ret != 0) 92 return (ret); 93 94 for (i = 0; i < count; i++) 95 nexus_add_irq(irqs[i]); 96 97 return (0); 98} 99 100int 101xen_msi_release(int *irqs, int count) 102{ 103 int i, ret; 104 105 for (i = 0; i < count; i++) { 106 ret = xen_release_msi(irqs[i]); 107 if (ret != 0) 108 return (ret); 109 } 110 111 return (0); 112} 113 114int 115xen_msi_map(int irq, uint64_t *addr, uint32_t *data) 116{ 117 118 return (0); 119} 120 121int 122xen_msix_alloc(device_t dev, int *irq) 123{ 124 125 return (ENXIO); 126} 127 128int 129xen_msix_release(int irq) 130{ 131 132 return (ENOENT); 133} 134