1 /*- 2 * Copyright (c) 2003-2005 Nate Lawson (SDG) 3 * Copyright (c) 2001 Michael Smith 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD: src/sys/dev/acpica/acpi_cpu.c,v 1.72 2008/04/12 12:06:00 rpaulo Exp $ 28 */ 29 30 #include "opt_acpi.h" 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kernel.h> 35 #include <sys/sysctl.h> 36 37 #include <machine/globaldata.h> 38 #include <machine/smp.h> 39 40 #include "acpi.h" 41 #include "acpivar.h" 42 #include "acpi_cpu.h" 43 #include "cpu_if.h" 44 45 #define ACPI_NOTIFY_PX_STATES 0x80 /* _PPC/_PDL changed. */ 46 #define ACPI_NOTIFY_CX_STATES 0x81 /* _CST changed. */ 47 48 static int acpi_cpu_probe(device_t dev); 49 static int acpi_cpu_attach(device_t dev); 50 static struct resource_list * 51 acpi_cpu_get_rlist(device_t, device_t); 52 static struct resource * 53 acpi_cpu_alloc_resource(device_t, device_t, 54 int, int *, u_long, u_long, u_long, u_int, int); 55 static int acpi_cpu_release_resource(device_t, device_t, 56 int, int, struct resource *); 57 static struct ksensordev * 58 acpi_cpu_get_sensdev(device_t); 59 60 static int acpi_cpu_get_id(uint32_t, uint32_t *, uint32_t *); 61 static void acpi_cpu_notify(ACPI_HANDLE, UINT32, void *); 62 63 static device_method_t acpi_cpu_methods[] = { 64 /* Device interface */ 65 DEVMETHOD(device_probe, acpi_cpu_probe), 66 DEVMETHOD(device_attach, acpi_cpu_attach), 67 DEVMETHOD(device_detach, bus_generic_detach), 68 DEVMETHOD(device_shutdown, bus_generic_shutdown), 69 DEVMETHOD(device_suspend, bus_generic_suspend), 70 DEVMETHOD(device_resume, bus_generic_resume), 71 72 /* Bus interface */ 73 DEVMETHOD(bus_add_child, bus_generic_add_child), 74 DEVMETHOD(bus_print_child, bus_generic_print_child), 75 DEVMETHOD(bus_read_ivar, bus_generic_read_ivar), 76 DEVMETHOD(bus_write_ivar, bus_generic_write_ivar), 77 DEVMETHOD(bus_get_resource_list, acpi_cpu_get_rlist), 78 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource), 79 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource), 80 DEVMETHOD(bus_alloc_resource, acpi_cpu_alloc_resource), 81 DEVMETHOD(bus_release_resource, acpi_cpu_release_resource), 82 DEVMETHOD(bus_driver_added, bus_generic_driver_added), 83 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 84 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 85 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 86 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 87 88 /* CPU interface */ 89 DEVMETHOD(cpu_get_sensdev, acpi_cpu_get_sensdev), 90 91 DEVMETHOD_END 92 }; 93 94 static driver_t acpi_cpu_driver = { 95 "cpu", 96 acpi_cpu_methods, 97 sizeof(struct acpi_cpu_softc) 98 }; 99 100 static devclass_t acpi_cpu_devclass; 101 DRIVER_MODULE(cpu, acpi, acpi_cpu_driver, acpi_cpu_devclass, NULL, NULL); 102 MODULE_DEPEND(cpu, acpi, 1, 1, 1); 103 104 static int 105 acpi_cpu_probe(device_t dev) 106 { 107 int acpi_id, cpu_id; 108 ACPI_BUFFER buf; 109 ACPI_HANDLE handle; 110 ACPI_STATUS status; 111 ACPI_OBJECT *obj; 112 113 if (acpi_disabled("cpu") || acpi_get_type(dev) != ACPI_TYPE_PROCESSOR) 114 return ENXIO; 115 116 handle = acpi_get_handle(dev); 117 118 /* 119 * Get our Processor object. 120 */ 121 buf.Pointer = NULL; 122 buf.Length = ACPI_ALLOCATE_BUFFER; 123 status = AcpiEvaluateObject(handle, NULL, NULL, &buf); 124 if (ACPI_FAILURE(status)) { 125 device_printf(dev, "probe failed to get Processor obj - %s\n", 126 AcpiFormatException(status)); 127 return ENXIO; 128 } 129 130 obj = (ACPI_OBJECT *)buf.Pointer; 131 if (obj->Type != ACPI_TYPE_PROCESSOR) { 132 device_printf(dev, "Processor object has bad type %d\n", obj->Type); 133 AcpiOsFree(obj); 134 return ENXIO; 135 } 136 137 acpi_id = obj->Processor.ProcId; 138 AcpiOsFree(obj); 139 140 /* 141 * Find the processor associated with our unit. We could use the 142 * ProcId as a key, however, some boxes do not have the same values 143 * in their Processor object as the ProcId values in the MADT. 144 */ 145 if (acpi_cpu_get_id(device_get_unit(dev), &acpi_id, &cpu_id) != 0) 146 return ENXIO; 147 148 acpi_set_magic(dev, cpu_id); 149 device_set_desc(dev, "ACPI CPU"); 150 151 return 0; 152 } 153 154 static int 155 acpi_cpu_attach(device_t dev) 156 { 157 struct acpi_cpu_softc *sc = device_get_softc(dev); 158 ACPI_HANDLE handle; 159 device_t child; 160 int cpu_id, cpu_features; 161 struct acpi_softc *acpi_sc; 162 163 sc->cpu_dev = dev; 164 165 handle = acpi_get_handle(dev); 166 cpu_id = acpi_get_magic(dev); 167 168 acpi_sc = acpi_device_get_parent_softc(dev); 169 if (cpu_id == 0) { 170 sysctl_ctx_init(&sc->glob_sysctl_ctx); 171 sc->glob_sysctl_tree = SYSCTL_ADD_NODE(&sc->glob_sysctl_ctx, 172 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), 173 OID_AUTO, "cpu", CTLFLAG_RD, 0, 174 "node for CPU global settings"); 175 if (sc->glob_sysctl_tree == NULL) 176 return ENOMEM; 177 } 178 179 sysctl_ctx_init(&sc->pcpu_sysctl_ctx); 180 sc->pcpu_sysctl_tree = SYSCTL_ADD_NODE(&sc->pcpu_sysctl_ctx, 181 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), 182 OID_AUTO, device_get_nameunit(dev), CTLFLAG_RD, 0, 183 "node for per-CPU settings"); 184 if (sc->pcpu_sysctl_tree == NULL) { 185 sysctl_ctx_free(&sc->glob_sysctl_ctx); 186 return ENOMEM; 187 } 188 189 /* 190 * Before calling any CPU methods, collect child driver feature hints 191 * and notify ACPI of them. We support unified SMP power control 192 * so advertise this ourselves. Note this is not the same as independent 193 * SMP control where each CPU can have different settings. 194 */ 195 cpu_features = ACPI_PDC_MP_C1PXTX | ACPI_PDC_MP_C2C3; 196 cpu_features |= acpi_cpu_md_features(); 197 198 /* 199 * CPU capabilities are specified as a buffer of 32-bit integers: 200 * revision, count, and one or more capabilities. 201 */ 202 if (cpu_features) { 203 uint32_t cap_set[3]; 204 ACPI_STATUS status; 205 206 cap_set[0] = 0; 207 cap_set[1] = cpu_features; 208 status = acpi_eval_osc(dev, handle, 209 "4077A616-290C-47BE-9EBD-D87058713953", 1, cap_set, 2); 210 211 if (ACPI_FAILURE(status)) { 212 ACPI_OBJECT_LIST arglist; 213 ACPI_OBJECT arg[4]; 214 215 if (bootverbose) 216 device_printf(dev, "_OSC failed, using _PDC\n"); 217 218 arglist.Pointer = arg; 219 arglist.Count = 1; 220 arg[0].Type = ACPI_TYPE_BUFFER; 221 arg[0].Buffer.Length = sizeof(cap_set); 222 arg[0].Buffer.Pointer = (uint8_t *)cap_set; 223 cap_set[0] = 1; /* revision */ 224 cap_set[1] = 1; /* # of capabilities integers */ 225 cap_set[2] = cpu_features; 226 AcpiEvaluateObject(handle, "_PDC", &arglist, NULL); 227 } 228 } 229 230 ksnprintf(sc->cpu_sensdev.xname, sizeof(sc->cpu_sensdev.xname), "%s", 231 device_get_nameunit(dev)); 232 sensordev_install(&sc->cpu_sensdev); 233 234 child = BUS_ADD_CHILD(dev, dev, 0, "cpu_cst", -1); 235 if (child == NULL) 236 return ENXIO; 237 acpi_set_handle(child, handle); 238 acpi_set_magic(child, cpu_id); 239 sc->cpu_cst = child; 240 241 child = BUS_ADD_CHILD(dev, dev, 0, "cpu_pst", -1); 242 if (child == NULL) 243 return ENXIO; 244 acpi_set_handle(child, handle); 245 acpi_set_magic(child, cpu_id); 246 sc->cpu_pst = child; 247 248 bus_generic_probe(dev); 249 bus_generic_attach(dev); 250 251 AcpiInstallNotifyHandler(handle, ACPI_DEVICE_NOTIFY, acpi_cpu_notify, sc); 252 253 return 0; 254 } 255 256 /* 257 * All resources are assigned directly to us by acpi, 258 * so 'child' is bypassed here. 259 */ 260 static struct resource_list * 261 acpi_cpu_get_rlist(device_t dev, device_t child __unused) 262 { 263 return BUS_GET_RESOURCE_LIST(device_get_parent(dev), dev); 264 } 265 266 static struct resource * 267 acpi_cpu_alloc_resource(device_t dev, device_t child __unused, 268 int type, int *rid, u_long start, u_long end, 269 u_long count, u_int flags, int cpuid) 270 { 271 return BUS_ALLOC_RESOURCE(device_get_parent(dev), dev, type, rid, 272 start, end, count, flags, cpuid); 273 } 274 275 static int 276 acpi_cpu_release_resource(device_t dev, device_t child __unused, 277 int type, int rid, struct resource *r) 278 { 279 return BUS_RELEASE_RESOURCE(device_get_parent(dev), dev, type, rid, r); 280 } 281 282 /* 283 * Find the nth present CPU and return its pc_cpuid as well as set the 284 * pc_acpi_id from the most reliable source. 285 */ 286 static int 287 acpi_cpu_get_id(uint32_t idx, uint32_t *acpi_id, uint32_t *cpu_id) 288 { 289 struct mdglobaldata *md; 290 uint32_t i; 291 292 KASSERT(acpi_id != NULL, ("Null acpi_id")); 293 KASSERT(cpu_id != NULL, ("Null cpu_id")); 294 for (i = 0; i < ncpus; i++) { 295 if (CPUMASK_TESTBIT(smp_active_mask, i) == 0) 296 continue; 297 md = (struct mdglobaldata *)globaldata_find(i); 298 KASSERT(md != NULL, ("no pcpu data for %d", i)); 299 if (idx-- == 0) { 300 /* 301 * If gd_acpi_id was not initialized (e.g., box w/o MADT) 302 * override it with the value from the ASL. Otherwise, if the 303 * two don't match, prefer the MADT-derived value. Finally, 304 * return the gd_cpuid to reference this processor. 305 */ 306 if (md->gd_acpi_id == 0xffffffff) { 307 kprintf("cpu%d: acpi id was not set, set it to %u\n", 308 i, *acpi_id); 309 md->gd_acpi_id = *acpi_id; 310 } else if (md->gd_acpi_id != *acpi_id) { 311 kprintf("cpu%d: acpi id mismatch, madt %u, " 312 "processor object %u\n", 313 i, md->gd_acpi_id, *acpi_id); 314 *acpi_id = md->gd_acpi_id; 315 } 316 *cpu_id = md->mi.gd_cpuid; 317 return 0; 318 } 319 } 320 return ESRCH; 321 } 322 323 static void 324 acpi_cpu_notify(ACPI_HANDLE handle __unused, UINT32 notify, void *xsc) 325 { 326 struct acpi_cpu_softc *sc = xsc; 327 328 switch (notify) { 329 case ACPI_NOTIFY_CX_STATES: 330 if (sc->cpu_cst_notify != NULL) 331 sc->cpu_cst_notify(sc->cpu_cst); 332 break; 333 case ACPI_NOTIFY_PX_STATES: 334 if (sc->cpu_pst_notify != NULL) 335 sc->cpu_pst_notify(sc->cpu_pst); 336 break; 337 default: 338 device_printf(sc->cpu_dev, "unknown notify: %#x\n", notify); 339 break; 340 } 341 } 342 343 static struct ksensordev * 344 acpi_cpu_get_sensdev(device_t dev) 345 { 346 struct acpi_cpu_softc *sc = device_get_softc(dev); 347 348 return &sc->cpu_sensdev; 349 } 350