sys/dev/ofw/ofw_cpu.c

   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         device_set_desc(dev, "Open Firmware CPU");
 195         return (0);
 196 }
 197
 198 static int
 199 ofw_cpu_attach(device_t dev)
 200 {
 201         struct ofw_cpulist_softc *psc;
 202         struct ofw_cpu_softc *sc;
 203         phandle_t node;
 204         pcell_t cell;
 205         int rv;
 206
 207         sc = device_get_softc(dev);
 208         psc = device_get_softc(device_get_parent(dev));
 209
 210         if (nitems(sc->sc_reg) < psc->sc_addr_cells) {
 211                 if (bootverbose)
 212                         device_printf(dev, "Too many address cells\n");
 213                 return (EINVAL);
 214         }
 215
 216         node = ofw_bus_get_node(dev);
 217
 218         /* Read and validate the reg property for use later */
 219         sc->sc_reg_valid = false;
 220         rv = OF_getencprop(node, "reg", sc->sc_reg, sizeof(sc->sc_reg));
 221         if (rv < 0)
 222                 device_printf(dev, "missing 'reg' property\n");
 223         else if ((rv % 4) != 0) {
 224                 if (bootverbose)
 225                         device_printf(dev, "Malformed reg property\n");
 226         } else if ((rv / 4) != psc->sc_addr_cells) {
 227                 if (bootverbose)
 228                         device_printf(dev, "Invalid reg size %u\n", rv);
 229         } else
 230                 sc->sc_reg_valid = true;
 231
 232 #ifdef __powerpc__
 233         /*
 234          * On powerpc, "interrupt-servers" denotes a SMT CPU.  Look for any
 235          * thread on this CPU, and assign that.
 236          */
 237         if (OF_hasprop(node, "ibm,ppc-interrupt-server#s")) {
 238                 struct cpuref cpuref;
 239                 cell_t *servers;
 240                 int i, nservers, rv;
 241
 242                 if ((nservers = OF_getencprop_alloc(node,
 243                     "ibm,ppc-interrupt-server#s", (void **)&servers)) < 0)
 244                         return (ENXIO);
 245                 nservers /= sizeof(cell_t);
 246                 for (i = 0; i < nservers; i++) {
 247                         for (rv = platform_smp_first_cpu(&cpuref); rv == 0;
 248                             rv = platform_smp_next_cpu(&cpuref)) {
 249                                 if (cpuref.cr_hwref == servers[i]) {
 250                                         sc->sc_cpu_pcpu =
 251                                             pcpu_find(cpuref.cr_cpuid);
 252                                         if (sc->sc_cpu_pcpu == NULL) {
 253                                                 OF_prop_free(servers);
 254                                                 return (ENXIO);
 255                                         }
 256                                         break;
 257                                 }
 258                         }
 259                         if (rv != ENOENT)
 260                                 break;
 261                 }
 262                 OF_prop_free(servers);
 263                 if (sc->sc_cpu_pcpu == NULL) {
 264                         device_printf(dev, "No CPU found for this device.\n");
 265                         return (ENXIO);
 266                 }
 267         } else
 268 #endif
 269         sc->sc_cpu_pcpu = pcpu_find(device_get_unit(dev));
 270
 271         if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) < 0) {
 272                 if (bootverbose)
 273                         device_printf(dev,
 274                             "missing 'clock-frequency' property\n");
 275         } else
 276                 sc->sc_nominal_mhz = cell / 1000000; /* convert to MHz */
 277
 278         bus_generic_probe(dev);
 279         return (bus_generic_attach(dev));
 280 }
 281
 282 static int
 283 ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
 284 {
 285         struct ofw_cpulist_softc *psc;
 286         struct ofw_cpu_softc *sc;
 287
 288         sc = device_get_softc(dev);
 289
 290         switch (index) {
 291         case CPU_IVAR_PCPU:
 292                 *result = (uintptr_t)sc->sc_cpu_pcpu;
 293                 return (0);
 294         case CPU_IVAR_NOMINAL_MHZ:
 295                 if (sc->sc_nominal_mhz > 0) {
 296                         *result = (uintptr_t)sc->sc_nominal_mhz;
 297                         return (0);
 298                 }
 299                 break;
 300         case CPU_IVAR_CPUID_SIZE:
 301                 psc = device_get_softc(device_get_parent(dev));
 302                 *result = psc->sc_addr_cells;
 303                 return (0);
 304         case CPU_IVAR_CPUID:
 305                 if (sc->sc_reg_valid) {
 306                         *result = (uintptr_t)sc->sc_reg;
 307                         return (0);
 308                 }
 309                 break;
 310         }
 311
 312         return (ENOENT);
 313 }
 314
 315 int
 316 ofw_cpu_early_foreach(ofw_cpu_foreach_cb callback, boolean_t only_runnable)
 317 {
 318         phandle_t node, child;
 319         pcell_t addr_cells, reg[2];
 320         char status[16];
 321         char device_type[16];
 322         u_int id, next_id;
 323         int count, rv;
 324
 325         count = 0;
 326         id = 0;
 327         next_id = 0;
 328
 329         node = OF_finddevice("/cpus");
 330         if (node == -1)
 331                 return (-1);
 332
 333         /* Find the number of cells in the cpu register */
 334         if (OF_getencprop(node, "#address-cells", &addr_cells,
 335             sizeof(addr_cells)) < 0)
 336                 return (-1);
 337
 338         for (child = OF_child(node); child != 0; child = OF_peer(child),
 339             id = next_id) {
 340
 341                 /* Check if child is a CPU */
 342                 memset(device_type, 0, sizeof(device_type));
 343                 rv = OF_getprop(child, "device_type", device_type,
 344                     sizeof(device_type) - 1);
 345                 if (rv < 0)
 346                         continue;
 347                 if (strcmp(device_type, "cpu") != 0)
 348                         continue;
 349
 350                 /* We're processing CPU, update next_id used in the next iteration */
 351                 next_id++;
 352
 353                 /*
 354                  * If we are filtering by runnable then limit to only
 355                  * those that have been enabled, or do provide a method
 356                  * to enable them.
 357                  */
 358                 if (only_runnable) {
 359                         status[0] = '\0';
 360                         OF_getprop(child, "status", status, sizeof(status));
 361                         if (status[0] != '\0' && strcmp(status, "okay") != 0 &&
 362                                 strcmp(status, "ok") != 0 &&
 363                                 !OF_hasprop(child, "enable-method"))
 364                                         continue;
 365                 }
 366
 367                 /*
 368                  * Check we have a register to identify the cpu
 369                  */
 370                 rv = OF_getencprop(child, "reg", reg,
 371                     addr_cells * sizeof(cell_t));
 372                 if (rv != addr_cells * sizeof(cell_t))
 373                         continue;
 374
 375                 if (callback == NULL || callback(id, child, addr_cells, reg))
 376                         count++;
 377         }
 378
 379         return (only_runnable ? count : id);
 380 }