1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2010 Hudson River Trading LLC 5 * Written by: John H. Baldwin <jhb@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * This driver provides a pseudo-bus to enumerate the PCI buses 32 * present on a system using a QPI chipset. It creates a qpi0 bus that 33 * is a child of nexus0 and then creates Host-PCI bridges as a 34 * child of that. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/bus.h> 39 #include <sys/kernel.h> 40 #include <sys/malloc.h> 41 #include <sys/module.h> 42 #include <sys/rman.h> 43 #include <sys/systm.h> 44 45 #include <machine/cputypes.h> 46 #include <machine/md_var.h> 47 #include <x86/legacyvar.h> 48 #include <x86/pci_cfgreg.h> 49 #include <x86/specialreg.h> 50 51 #include <dev/pci/pcireg.h> 52 #include <dev/pci/pcivar.h> 53 #include <dev/pci/pcib_private.h> 54 #include "pcib_if.h" 55 56 struct qpi_device { 57 int qd_pcibus; 58 }; 59 60 static MALLOC_DEFINE(M_QPI, "qpidrv", "qpi system device"); 61 62 static void 63 qpi_identify(driver_t *driver, device_t parent) 64 { 65 int do_qpi; 66 67 /* Check CPUID to ensure this is an i7 CPU of some sort. */ 68 if (cpu_vendor_id != CPU_VENDOR_INTEL || 69 CPUID_TO_FAMILY(cpu_id) != 0x6) 70 return; 71 72 /* Only discover buses with configuration devices if allowed by user */ 73 do_qpi = 0; 74 TUNABLE_INT_FETCH("hw.attach_intel_csr_pci", &do_qpi); 75 if (!do_qpi) 76 return; 77 78 /* PCI config register access is required. */ 79 if (pci_cfgregopen() == 0) 80 return; 81 82 /* Add a qpi bus device. */ 83 if (BUS_ADD_CHILD(parent, 20, "qpi", -1) == NULL) 84 panic("Failed to add qpi bus"); 85 } 86 87 static int 88 qpi_probe(device_t dev) 89 { 90 91 device_set_desc(dev, "QPI system bus"); 92 return (BUS_PROBE_SPECIFIC); 93 } 94 95 /* 96 * Look for a PCI bus with the specified bus address. If one is found, 97 * add a pcib device and return 0. Otherwise, return an error code. 98 */ 99 static int 100 qpi_probe_pcib(device_t dev, int bus) 101 { 102 struct qpi_device *qdev; 103 device_t child; 104 uint32_t devid; 105 int s; 106 107 /* 108 * If a PCI bus already exists for this bus number, then 109 * fail. 110 */ 111 if (pci_find_bsf(bus, 0, 0) != NULL) 112 return (EEXIST); 113 114 /* 115 * Attempt to read the device id for every slot, function 0 on 116 * the bus. If all read values are 0xffffffff this means that 117 * the bus is not present. 118 */ 119 for (s = 0; s <= PCI_SLOTMAX; s++) { 120 devid = pci_cfgregread(0, bus, s, 0, PCIR_DEVVENDOR, 4); 121 if (devid != 0xffffffff) 122 break; 123 } 124 if (devid == 0xffffffff) 125 return (ENOENT); 126 127 if ((devid & 0xffff) != 0x8086) { 128 if (bootverbose) 129 device_printf(dev, 130 "Device at pci%d.%d.0 has non-Intel vendor 0x%x\n", 131 bus, s, devid & 0xffff); 132 return (ENXIO); 133 } 134 135 child = BUS_ADD_CHILD(dev, 0, "pcib", DEVICE_UNIT_ANY); 136 if (child == NULL) 137 panic("%s: failed to add pci bus %d", device_get_nameunit(dev), 138 bus); 139 qdev = malloc(sizeof(struct qpi_device), M_QPI, M_WAITOK); 140 qdev->qd_pcibus = bus; 141 device_set_ivars(child, qdev); 142 return (0); 143 } 144 145 static int 146 qpi_attach(device_t dev) 147 { 148 int bus; 149 150 /* 151 * Each processor socket has a dedicated PCI bus, sometimes 152 * not enumerated by ACPI. Probe all unattached buses from 0 153 * to 255. 154 */ 155 for (bus = PCI_BUSMAX; bus >= 0; bus--) 156 qpi_probe_pcib(dev, bus); 157 158 return (bus_generic_attach(dev)); 159 } 160 161 static int 162 qpi_print_child(device_t bus, device_t child) 163 { 164 struct qpi_device *qdev; 165 int retval = 0; 166 167 qdev = device_get_ivars(child); 168 retval += bus_print_child_header(bus, child); 169 if (qdev->qd_pcibus != -1) 170 retval += printf(" pcibus %d", qdev->qd_pcibus); 171 retval += bus_print_child_footer(bus, child); 172 173 return (retval); 174 } 175 176 static int 177 qpi_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 178 { 179 struct qpi_device *qdev; 180 181 qdev = device_get_ivars(child); 182 switch (which) { 183 case PCIB_IVAR_BUS: 184 *result = qdev->qd_pcibus; 185 break; 186 default: 187 return (ENOENT); 188 } 189 return (0); 190 } 191 192 static device_method_t qpi_methods[] = { 193 /* Device interface */ 194 DEVMETHOD(device_identify, qpi_identify), 195 DEVMETHOD(device_probe, qpi_probe), 196 DEVMETHOD(device_attach, qpi_attach), 197 DEVMETHOD(device_shutdown, bus_generic_shutdown), 198 DEVMETHOD(device_suspend, bus_generic_suspend), 199 DEVMETHOD(device_resume, bus_generic_resume), 200 201 /* Bus interface */ 202 DEVMETHOD(bus_print_child, qpi_print_child), 203 DEVMETHOD(bus_add_child, bus_generic_add_child), 204 DEVMETHOD(bus_read_ivar, qpi_read_ivar), 205 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), 206 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 207 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 208 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 209 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 210 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 211 { 0, 0 } 212 }; 213 214 DEFINE_CLASS_0(qpi, qpi_driver, qpi_methods, 0); 215 DRIVER_MODULE(qpi, nexus, qpi_driver, 0, 0); 216 217 static int 218 qpi_pcib_probe(device_t dev) 219 { 220 221 device_set_desc(dev, "QPI Host-PCI bridge"); 222 return (BUS_PROBE_SPECIFIC); 223 } 224 225 static int 226 qpi_pcib_attach(device_t dev) 227 { 228 229 device_add_child(dev, "pci", DEVICE_UNIT_ANY); 230 return (bus_generic_attach(dev)); 231 } 232 233 static int 234 qpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 235 { 236 237 switch (which) { 238 case PCIB_IVAR_DOMAIN: 239 *result = 0; 240 return (0); 241 case PCIB_IVAR_BUS: 242 *result = pcib_get_bus(dev); 243 return (0); 244 default: 245 return (ENOENT); 246 } 247 } 248 249 static struct resource * 250 qpi_pcib_alloc_resource(device_t dev, device_t child, int type, int *rid, 251 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 252 { 253 254 if (type == PCI_RES_BUS) 255 return (pci_domain_alloc_bus(0, child, rid, start, end, count, 256 flags)); 257 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 258 count, flags)); 259 } 260 261 static int 262 qpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, 263 uint32_t *data) 264 { 265 device_t bus; 266 267 bus = device_get_parent(pcib); 268 return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data)); 269 } 270 271 static device_method_t qpi_pcib_methods[] = { 272 /* Device interface */ 273 DEVMETHOD(device_probe, qpi_pcib_probe), 274 DEVMETHOD(device_attach, qpi_pcib_attach), 275 DEVMETHOD(device_shutdown, bus_generic_shutdown), 276 DEVMETHOD(device_suspend, bus_generic_suspend), 277 DEVMETHOD(device_resume, bus_generic_resume), 278 279 /* Bus interface */ 280 DEVMETHOD(bus_read_ivar, qpi_pcib_read_ivar), 281 DEVMETHOD(bus_alloc_resource, qpi_pcib_alloc_resource), 282 DEVMETHOD(bus_adjust_resource, legacy_pcib_adjust_resource), 283 DEVMETHOD(bus_release_resource, legacy_pcib_release_resource), 284 DEVMETHOD(bus_activate_resource, legacy_pcib_activate_resource), 285 DEVMETHOD(bus_deactivate_resource, legacy_pcib_deactivate_resource), 286 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 287 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 288 289 /* pcib interface */ 290 DEVMETHOD(pcib_maxslots, pcib_maxslots), 291 DEVMETHOD(pcib_read_config, legacy_pcib_read_config), 292 DEVMETHOD(pcib_write_config, legacy_pcib_write_config), 293 DEVMETHOD(pcib_alloc_msi, legacy_pcib_alloc_msi), 294 DEVMETHOD(pcib_release_msi, pcib_release_msi), 295 DEVMETHOD(pcib_alloc_msix, legacy_pcib_alloc_msix), 296 DEVMETHOD(pcib_release_msix, pcib_release_msix), 297 DEVMETHOD(pcib_map_msi, qpi_pcib_map_msi), 298 299 DEVMETHOD_END 300 }; 301 302 DEFINE_CLASS_0(pcib, qpi_pcib_driver, qpi_pcib_methods, 0); 303 DRIVER_MODULE(pcib, qpi, qpi_pcib_driver, 0, 0); 304