1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2021 The FreeBSD Foundation 5 * 6 * Portions of this software were developed by Ka Ho Ng 7 * under sponsorship from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice unmodified, this list of conditions, and the following 14 * disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/param.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/rman.h> 36 37 #include <dev/pci/pcireg.h> 38 #include <dev/pci/pcivar.h> 39 40 #include "amdvi_priv.h" 41 #include "ivhd_if.h" 42 43 struct amdiommu_softc { 44 struct resource *event_res; /* Event interrupt resource. */ 45 void *event_tag; /* Event interrupt tag. */ 46 int event_rid; 47 }; 48 49 static int amdiommu_probe(device_t); 50 static int amdiommu_attach(device_t); 51 static int amdiommu_detach(device_t); 52 static int ivhd_setup_intr(device_t, driver_intr_t, void *, 53 const char *); 54 static int ivhd_teardown_intr(device_t); 55 56 static device_method_t amdiommu_methods[] = { 57 /* device interface */ 58 DEVMETHOD(device_probe, amdiommu_probe), 59 DEVMETHOD(device_attach, amdiommu_attach), 60 DEVMETHOD(device_detach, amdiommu_detach), 61 DEVMETHOD(ivhd_setup_intr, ivhd_setup_intr), 62 DEVMETHOD(ivhd_teardown_intr, ivhd_teardown_intr), 63 DEVMETHOD_END 64 }; 65 static driver_t amdiommu_driver = { 66 "amdiommu", 67 amdiommu_methods, 68 sizeof(struct amdiommu_softc), 69 }; 70 71 static int 72 amdiommu_probe(device_t dev) 73 { 74 int error; 75 int capoff; 76 77 /* 78 * Check base class and sub-class 79 */ 80 if (pci_get_class(dev) != PCIC_BASEPERIPH || 81 pci_get_subclass(dev) != PCIS_BASEPERIPH_IOMMU) 82 return (ENXIO); 83 84 /* 85 * A IOMMU capability block carries a 0Fh capid. 86 */ 87 error = pci_find_cap(dev, PCIY_SECDEV, &capoff); 88 if (error) 89 return (ENXIO); 90 91 /* 92 * bit [18:16] == 011b indicates the capability block is IOMMU 93 * capability block. If the field is not set to 011b, bail out. 94 */ 95 if ((pci_read_config(dev, capoff + 2, 2) & 0x7) != 0x3) 96 return (ENXIO); 97 98 return (BUS_PROBE_SPECIFIC); 99 } 100 101 static int 102 amdiommu_attach(device_t dev) 103 { 104 105 device_set_desc(dev, "AMD-Vi/IOMMU PCI function"); 106 return (0); 107 } 108 109 static int 110 amdiommu_detach(device_t dev) 111 { 112 113 return (0); 114 } 115 116 static int 117 ivhd_setup_intr(device_t dev, driver_intr_t handler, void *arg, 118 const char *desc) 119 { 120 struct amdiommu_softc *sc; 121 int error, msicnt; 122 123 sc = device_get_softc(dev); 124 msicnt = 1; 125 if (sc->event_res != NULL) 126 panic("%s is called without intr teardown", __func__); 127 sc->event_rid = 1; 128 129 error = pci_alloc_msi(dev, &msicnt); 130 if (error) { 131 device_printf(dev, "Couldn't find event MSI IRQ resource.\n"); 132 return (ENOENT); 133 } 134 135 sc->event_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, 136 &sc->event_rid, RF_ACTIVE); 137 if (sc->event_res == NULL) { 138 device_printf(dev, "Unable to allocate event INTR resource.\n"); 139 error = ENOMEM; 140 goto fail; 141 } 142 143 error = bus_setup_intr(dev, sc->event_res, INTR_TYPE_MISC | INTR_MPSAFE, 144 NULL, handler, arg, &sc->event_tag); 145 if (error) { 146 device_printf(dev, "Fail to setup event intr\n"); 147 goto fail; 148 } 149 150 bus_describe_intr(dev, sc->event_res, sc->event_tag, "%s", desc); 151 return (0); 152 153 fail: 154 ivhd_teardown_intr(dev); 155 return (error); 156 } 157 158 static int 159 ivhd_teardown_intr(device_t dev) 160 { 161 struct amdiommu_softc *sc; 162 163 sc = device_get_softc(dev); 164 165 if (sc->event_tag != NULL) { 166 bus_teardown_intr(dev, sc->event_res, sc->event_tag); 167 sc->event_tag = NULL; 168 } 169 if (sc->event_res != NULL) { 170 bus_release_resource(dev, SYS_RES_IRQ, sc->event_rid, 171 sc->event_res); 172 sc->event_res = NULL; 173 } 174 pci_release_msi(dev); 175 return (0); 176 } 177 178 /* This driver has to be loaded before ivhd */ 179 DRIVER_MODULE(amdiommu, pci, amdiommu_driver, 0, 0); 180 MODULE_DEPEND(amdiommu, pci, 1, 1, 1); 181