1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2008 Citrix Systems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/module.h> 37 38 #include <machine/bus.h> 39 #include <machine/resource.h> 40 #include <sys/rman.h> 41 42 #include <machine/stdarg.h> 43 44 #include <xen/xen-os.h> 45 #include <xen/features.h> 46 #include <xen/hypervisor.h> 47 #include <xen/hvm.h> 48 #include <xen/xen_intr.h> 49 50 #include <dev/pci/pcireg.h> 51 #include <dev/pci/pcivar.h> 52 53 #include <dev/xen/xenpci/xenpcivar.h> 54 55 static int 56 xenpci_irq_init(device_t device, struct xenpci_softc *scp) 57 { 58 int error; 59 60 error = BUS_SETUP_INTR(device_get_parent(device), device, 61 scp->res_irq, INTR_MPSAFE|INTR_TYPE_MISC, 62 xen_intr_handle_upcall, NULL, NULL, 63 &scp->intr_cookie); 64 if (error) 65 return error; 66 67 #ifdef SMP 68 /* 69 * When using the PCI event delivery callback we cannot assign 70 * events to specific vCPUs, so all events are delivered to vCPU#0 by 71 * Xen. Since the PCI interrupt can fire on any CPU by default, we 72 * need to bind it to vCPU#0 in order to ensure that 73 * xen_intr_handle_upcall always gets called on vCPU#0. 74 */ 75 error = BUS_BIND_INTR(device_get_parent(device), device, 76 scp->res_irq, 0); 77 if (error) 78 return error; 79 #endif 80 81 xen_hvm_set_callback(device); 82 return (0); 83 } 84 85 /* 86 * Deallocate anything allocated by xenpci_allocate_resources. 87 */ 88 static int 89 xenpci_deallocate_resources(device_t dev) 90 { 91 struct xenpci_softc *scp = device_get_softc(dev); 92 93 if (scp->res_irq != 0) { 94 bus_deactivate_resource(dev, SYS_RES_IRQ, 95 scp->rid_irq, scp->res_irq); 96 bus_release_resource(dev, SYS_RES_IRQ, 97 scp->rid_irq, scp->res_irq); 98 scp->res_irq = 0; 99 } 100 101 return (0); 102 } 103 104 /* 105 * Allocate irq and memory resources. 106 */ 107 static int 108 xenpci_allocate_resources(device_t dev) 109 { 110 struct xenpci_softc *scp = device_get_softc(dev); 111 112 scp->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, 113 &scp->rid_irq, RF_SHAREABLE|RF_ACTIVE); 114 if (scp->res_irq == NULL) { 115 printf("xenpci Could not allocate irq.\n"); 116 goto errexit; 117 } 118 119 return (0); 120 121 errexit: 122 /* Cleanup anything we may have assigned. */ 123 xenpci_deallocate_resources(dev); 124 return (ENXIO); /* For want of a better idea. */ 125 } 126 127 /* 128 * Probe - just check device ID. 129 */ 130 static int 131 xenpci_probe(device_t dev) 132 { 133 134 if (pci_get_devid(dev) != 0x00015853) 135 return (ENXIO); 136 137 device_set_desc(dev, "Xen Platform Device"); 138 return (BUS_PROBE_DEFAULT); 139 } 140 141 /* 142 * Attach - find resources and talk to Xen. 143 */ 144 static int 145 xenpci_attach(device_t dev) 146 { 147 struct xenpci_softc *scp = device_get_softc(dev); 148 int error; 149 150 error = xenpci_allocate_resources(dev); 151 if (error) { 152 device_printf(dev, "xenpci_allocate_resources failed(%d).\n", 153 error); 154 goto errexit; 155 } 156 157 /* 158 * Hook the irq up to evtchn 159 */ 160 error = xenpci_irq_init(dev, scp); 161 if (error) { 162 device_printf(dev, "xenpci_irq_init failed(%d).\n", 163 error); 164 goto errexit; 165 } 166 167 return (0); 168 169 errexit: 170 /* 171 * Undo anything we may have done. 172 */ 173 xenpci_deallocate_resources(dev); 174 return (error); 175 } 176 177 /* 178 * Detach - reverse anything done by attach. 179 */ 180 static int 181 xenpci_detach(device_t dev) 182 { 183 struct xenpci_softc *scp = device_get_softc(dev); 184 device_t parent = device_get_parent(dev); 185 186 /* 187 * Take our interrupt handler out of the list of handlers 188 * that can handle this irq. 189 */ 190 if (scp->intr_cookie != NULL) { 191 if (BUS_TEARDOWN_INTR(parent, dev, 192 scp->res_irq, scp->intr_cookie) != 0) 193 device_printf(dev, 194 "intr teardown failed.. continuing\n"); 195 scp->intr_cookie = NULL; 196 } 197 198 /* 199 * Deallocate any system resources we may have 200 * allocated on behalf of this driver. 201 */ 202 return (xenpci_deallocate_resources(dev)); 203 } 204 205 static int 206 xenpci_resume(device_t dev) 207 { 208 xen_hvm_set_callback(dev); 209 return (0); 210 } 211 212 static device_method_t xenpci_methods[] = { 213 /* Device interface */ 214 DEVMETHOD(device_probe, xenpci_probe), 215 DEVMETHOD(device_attach, xenpci_attach), 216 DEVMETHOD(device_detach, xenpci_detach), 217 DEVMETHOD(device_resume, xenpci_resume), 218 { 0, 0 } 219 }; 220 221 static driver_t xenpci_driver = { 222 "xenpci", 223 xenpci_methods, 224 sizeof(struct xenpci_softc), 225 }; 226 227 DRIVER_MODULE(xenpci, pci, xenpci_driver, 0, 0); 228