1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 /* 56 * This is used to find our platform device instance. 57 */ 58 static devclass_t xenpci_devclass; 59 60 static int 61 xenpci_intr_filter(void *trap_frame) 62 { 63 xen_intr_handle_upcall(trap_frame); 64 return (FILTER_HANDLED); 65 } 66 67 static int 68 xenpci_irq_init(device_t device, struct xenpci_softc *scp) 69 { 70 int error; 71 72 error = BUS_SETUP_INTR(device_get_parent(device), device, 73 scp->res_irq, INTR_MPSAFE|INTR_TYPE_MISC, 74 xenpci_intr_filter, NULL, /*trap_frame*/NULL, 75 &scp->intr_cookie); 76 if (error) 77 return error; 78 79 #ifdef SMP 80 /* 81 * When using the PCI event delivery callback we cannot assign 82 * events to specific vCPUs, so all events are delivered to vCPU#0 by 83 * Xen. Since the PCI interrupt can fire on any CPU by default, we 84 * need to bind it to vCPU#0 in order to ensure that 85 * xen_intr_handle_upcall always gets called on vCPU#0. 86 */ 87 error = BUS_BIND_INTR(device_get_parent(device), device, 88 scp->res_irq, 0); 89 if (error) 90 return error; 91 #endif 92 93 xen_hvm_set_callback(device); 94 return (0); 95 } 96 97 /* 98 * Deallocate anything allocated by xenpci_allocate_resources. 99 */ 100 static int 101 xenpci_deallocate_resources(device_t dev) 102 { 103 struct xenpci_softc *scp = device_get_softc(dev); 104 105 if (scp->res_irq != 0) { 106 bus_deactivate_resource(dev, SYS_RES_IRQ, 107 scp->rid_irq, scp->res_irq); 108 bus_release_resource(dev, SYS_RES_IRQ, 109 scp->rid_irq, scp->res_irq); 110 scp->res_irq = 0; 111 } 112 113 return (0); 114 } 115 116 /* 117 * Allocate irq and memory resources. 118 */ 119 static int 120 xenpci_allocate_resources(device_t dev) 121 { 122 struct xenpci_softc *scp = device_get_softc(dev); 123 124 scp->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, 125 &scp->rid_irq, RF_SHAREABLE|RF_ACTIVE); 126 if (scp->res_irq == NULL) { 127 printf("xenpci Could not allocate irq.\n"); 128 goto errexit; 129 } 130 131 return (0); 132 133 errexit: 134 /* Cleanup anything we may have assigned. */ 135 xenpci_deallocate_resources(dev); 136 return (ENXIO); /* For want of a better idea. */ 137 } 138 139 /* 140 * Probe - just check device ID. 141 */ 142 static int 143 xenpci_probe(device_t dev) 144 { 145 146 if (pci_get_devid(dev) != 0x00015853) 147 return (ENXIO); 148 149 device_set_desc(dev, "Xen Platform Device"); 150 return (BUS_PROBE_DEFAULT); 151 } 152 153 /* 154 * Attach - find resources and talk to Xen. 155 */ 156 static int 157 xenpci_attach(device_t dev) 158 { 159 struct xenpci_softc *scp = device_get_softc(dev); 160 int error; 161 162 error = xenpci_allocate_resources(dev); 163 if (error) { 164 device_printf(dev, "xenpci_allocate_resources failed(%d).\n", 165 error); 166 goto errexit; 167 } 168 169 /* 170 * Hook the irq up to evtchn 171 */ 172 error = xenpci_irq_init(dev, scp); 173 if (error) { 174 device_printf(dev, "xenpci_irq_init failed(%d).\n", 175 error); 176 goto errexit; 177 } 178 179 return (0); 180 181 errexit: 182 /* 183 * Undo anything we may have done. 184 */ 185 xenpci_deallocate_resources(dev); 186 return (error); 187 } 188 189 /* 190 * Detach - reverse anything done by attach. 191 */ 192 static int 193 xenpci_detach(device_t dev) 194 { 195 struct xenpci_softc *scp = device_get_softc(dev); 196 device_t parent = device_get_parent(dev); 197 198 /* 199 * Take our interrupt handler out of the list of handlers 200 * that can handle this irq. 201 */ 202 if (scp->intr_cookie != NULL) { 203 if (BUS_TEARDOWN_INTR(parent, dev, 204 scp->res_irq, scp->intr_cookie) != 0) 205 device_printf(dev, 206 "intr teardown failed.. continuing\n"); 207 scp->intr_cookie = NULL; 208 } 209 210 /* 211 * Deallocate any system resources we may have 212 * allocated on behalf of this driver. 213 */ 214 return (xenpci_deallocate_resources(dev)); 215 } 216 217 static int 218 xenpci_resume(device_t dev) 219 { 220 xen_hvm_set_callback(dev); 221 return (0); 222 } 223 224 static device_method_t xenpci_methods[] = { 225 /* Device interface */ 226 DEVMETHOD(device_probe, xenpci_probe), 227 DEVMETHOD(device_attach, xenpci_attach), 228 DEVMETHOD(device_detach, xenpci_detach), 229 DEVMETHOD(device_resume, xenpci_resume), 230 { 0, 0 } 231 }; 232 233 static driver_t xenpci_driver = { 234 "xenpci", 235 xenpci_methods, 236 sizeof(struct xenpci_softc), 237 }; 238 239 DRIVER_MODULE(xenpci, pci, xenpci_driver, xenpci_devclass, 0, 0); 240