1 /*- 2 * Copyright (C) 2009 Nathan Whitehorn 3 * Copyright (C) 2015 The FreeBSD Foundation 4 * All rights reserved. 5 * 6 * Portions of this software were developed by Andrew Turner 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, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <sys/malloc.h> 39 #include <sys/bus.h> 40 #include <sys/cpu.h> 41 #include <machine/bus.h> 42 43 #include <dev/ofw/openfirm.h> 44 #include <dev/ofw/ofw_bus.h> 45 #include <dev/ofw/ofw_bus_subr.h> 46 #include <dev/ofw/ofw_cpu.h> 47 48 static int ofw_cpulist_probe(device_t); 49 static int ofw_cpulist_attach(device_t); 50 static const struct ofw_bus_devinfo *ofw_cpulist_get_devinfo(device_t dev, 51 device_t child); 52 53 static MALLOC_DEFINE(M_OFWCPU, "ofwcpu", "OFW CPU device information"); 54 55 struct ofw_cpulist_softc { 56 pcell_t sc_addr_cells; 57 }; 58 59 static device_method_t ofw_cpulist_methods[] = { 60 /* Device interface */ 61 DEVMETHOD(device_probe, ofw_cpulist_probe), 62 DEVMETHOD(device_attach, ofw_cpulist_attach), 63 64 /* Bus interface */ 65 DEVMETHOD(bus_add_child, bus_generic_add_child), 66 DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str), 67 68 /* ofw_bus interface */ 69 DEVMETHOD(ofw_bus_get_devinfo, ofw_cpulist_get_devinfo), 70 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat), 71 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model), 72 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name), 73 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node), 74 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type), 75 76 DEVMETHOD_END 77 }; 78 79 static driver_t ofw_cpulist_driver = { 80 "cpulist", 81 ofw_cpulist_methods, 82 sizeof(struct ofw_cpulist_softc) 83 }; 84 85 static devclass_t ofw_cpulist_devclass; 86 87 DRIVER_MODULE(ofw_cpulist, ofwbus, ofw_cpulist_driver, ofw_cpulist_devclass, 88 0, 0); 89 90 static int 91 ofw_cpulist_probe(device_t dev) 92 { 93 const char *name; 94 95 name = ofw_bus_get_name(dev); 96 97 if (name == NULL || strcmp(name, "cpus") != 0) 98 return (ENXIO); 99 100 device_set_desc(dev, "Open Firmware CPU Group"); 101 102 return (0); 103 } 104 105 static int 106 ofw_cpulist_attach(device_t dev) 107 { 108 struct ofw_cpulist_softc *sc; 109 phandle_t root, child; 110 device_t cdev; 111 struct ofw_bus_devinfo *dinfo; 112 113 sc = device_get_softc(dev); 114 root = ofw_bus_get_node(dev); 115 116 sc->sc_addr_cells = 1; 117 OF_getencprop(root, "#address-cells", &sc->sc_addr_cells, 118 sizeof(sc->sc_addr_cells)); 119 120 for (child = OF_child(root); child != 0; child = OF_peer(child)) { 121 dinfo = malloc(sizeof(*dinfo), M_OFWCPU, M_WAITOK | M_ZERO); 122 123 if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) { 124 free(dinfo, M_OFWCPU); 125 continue; 126 } 127 cdev = device_add_child(dev, NULL, -1); 128 if (cdev == NULL) { 129 device_printf(dev, "<%s>: device_add_child failed\n", 130 dinfo->obd_name); 131 ofw_bus_gen_destroy_devinfo(dinfo); 132 free(dinfo, M_OFWCPU); 133 continue; 134 } 135 device_set_ivars(cdev, dinfo); 136 } 137 138 return (bus_generic_attach(dev)); 139 } 140 141 static const struct ofw_bus_devinfo * 142 ofw_cpulist_get_devinfo(device_t dev, device_t child) 143 { 144 return (device_get_ivars(child)); 145 } 146 147 static int ofw_cpu_probe(device_t); 148 static int ofw_cpu_attach(device_t); 149 static int ofw_cpu_read_ivar(device_t dev, device_t child, int index, 150 uintptr_t *result); 151 152 struct ofw_cpu_softc { 153 struct pcpu *sc_cpu_pcpu; 154 uint32_t sc_nominal_mhz; 155 boolean_t sc_reg_valid; 156 pcell_t sc_reg[2]; 157 }; 158 159 static device_method_t ofw_cpu_methods[] = { 160 /* Device interface */ 161 DEVMETHOD(device_probe, ofw_cpu_probe), 162 DEVMETHOD(device_attach, ofw_cpu_attach), 163 164 /* Bus interface */ 165 DEVMETHOD(bus_add_child, bus_generic_add_child), 166 DEVMETHOD(bus_read_ivar, ofw_cpu_read_ivar), 167 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 168 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 169 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), 170 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 171 DEVMETHOD(bus_activate_resource,bus_generic_activate_resource), 172 173 DEVMETHOD_END 174 }; 175 176 static driver_t ofw_cpu_driver = { 177 "cpu", 178 ofw_cpu_methods, 179 sizeof(struct ofw_cpu_softc) 180 }; 181 182 static devclass_t ofw_cpu_devclass; 183 184 DRIVER_MODULE(ofw_cpu, cpulist, ofw_cpu_driver, ofw_cpu_devclass, 0, 0); 185 186 static int 187 ofw_cpu_probe(device_t dev) 188 { 189 const char *type = ofw_bus_get_type(dev); 190 191 if (type == NULL || strcmp(type, "cpu") != 0) 192 return (ENXIO); 193 194 /* Skip SMT CPUs, which we can't reasonably represent with this code */ 195 if (OF_hasprop(ofw_bus_get_node(dev), "ibm,ppc-interrupt-server#s")) 196 return (ENXIO); 197 198 device_set_desc(dev, "Open Firmware CPU"); 199 return (0); 200 } 201 202 static int 203 ofw_cpu_attach(device_t dev) 204 { 205 struct ofw_cpulist_softc *psc; 206 struct ofw_cpu_softc *sc; 207 phandle_t node; 208 pcell_t cell; 209 int rv; 210 211 sc = device_get_softc(dev); 212 psc = device_get_softc(device_get_parent(dev)); 213 214 if (nitems(sc->sc_reg) < psc->sc_addr_cells) { 215 if (bootverbose) 216 device_printf(dev, "Too many address cells\n"); 217 return (EINVAL); 218 } 219 220 node = ofw_bus_get_node(dev); 221 222 /* Read and validate the reg property for use later */ 223 sc->sc_reg_valid = false; 224 rv = OF_getencprop(node, "reg", sc->sc_reg, sizeof(sc->sc_reg)); 225 if (rv < 0) 226 device_printf(dev, "missing 'reg' property\n"); 227 else if ((rv % 4) != 0) { 228 if (bootverbose) 229 device_printf(dev, "Malformed reg property\n"); 230 } else if ((rv / 4) != psc->sc_addr_cells) { 231 if (bootverbose) 232 device_printf(dev, "Invalid reg size %u\n", rv); 233 } else 234 sc->sc_reg_valid = true; 235 236 sc->sc_cpu_pcpu = pcpu_find(device_get_unit(dev)); 237 238 if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) < 0) { 239 if (bootverbose) 240 device_printf(dev, 241 "missing 'clock-frequency' property\n"); 242 } else 243 sc->sc_nominal_mhz = cell / 1000000; /* convert to MHz */ 244 245 bus_generic_probe(dev); 246 return (bus_generic_attach(dev)); 247 } 248 249 static int 250 ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result) 251 { 252 struct ofw_cpulist_softc *psc; 253 struct ofw_cpu_softc *sc; 254 255 sc = device_get_softc(dev); 256 257 switch (index) { 258 case CPU_IVAR_PCPU: 259 *result = (uintptr_t)sc->sc_cpu_pcpu; 260 return (0); 261 case CPU_IVAR_NOMINAL_MHZ: 262 if (sc->sc_nominal_mhz > 0) { 263 *result = (uintptr_t)sc->sc_nominal_mhz; 264 return (0); 265 } 266 break; 267 case CPU_IVAR_CPUID_SIZE: 268 psc = device_get_softc(device_get_parent(dev)); 269 *result = psc->sc_addr_cells; 270 return (0); 271 case CPU_IVAR_CPUID: 272 if (sc->sc_reg_valid) { 273 *result = (uintptr_t)sc->sc_reg; 274 return (0); 275 } 276 break; 277 } 278 279 return (ENOENT); 280 } 281 282 int 283 ofw_cpu_early_foreach(ofw_cpu_foreach_cb callback, boolean_t only_runnable) 284 { 285 phandle_t node, child; 286 pcell_t addr_cells, reg[2]; 287 char status[16]; 288 char device_type[16]; 289 u_int id, next_id; 290 int count, rv; 291 292 count = 0; 293 id = 0; 294 next_id = 0; 295 296 node = OF_finddevice("/cpus"); 297 if (node == -1) 298 return (-1); 299 300 /* Find the number of cells in the cpu register */ 301 if (OF_getencprop(node, "#address-cells", &addr_cells, 302 sizeof(addr_cells)) < 0) 303 return (-1); 304 305 for (child = OF_child(node); child != 0; child = OF_peer(child), 306 id = next_id) { 307 308 /* Check if child is a CPU */ 309 memset(device_type, 0, sizeof(device_type)); 310 rv = OF_getprop(child, "device_type", device_type, 311 sizeof(device_type) - 1); 312 if (rv < 0) 313 continue; 314 if (strcmp(device_type, "cpu") != 0) 315 continue; 316 317 /* We're processing CPU, update next_id used in the next iteration */ 318 next_id++; 319 320 /* 321 * If we are filtering by runnable then limit to only 322 * those that have been enabled, or do provide a method 323 * to enable them. 324 */ 325 if (only_runnable) { 326 status[0] = '\0'; 327 OF_getprop(child, "status", status, sizeof(status)); 328 if (status[0] != '\0' && strcmp(status, "okay") != 0 && 329 strcmp(status, "ok") != 0 && 330 !OF_hasprop(child, "enable-method")) 331 continue; 332 } 333 334 /* 335 * Check we have a register to identify the cpu 336 */ 337 rv = OF_getencprop(child, "reg", reg, 338 addr_cells * sizeof(cell_t)); 339 if (rv != addr_cells * sizeof(cell_t)) 340 continue; 341 342 if (callback == NULL || callback(id, child, addr_cells, reg)) 343 count++; 344 } 345 346 return (only_runnable ? count : id); 347 } 348