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_CX_STATES 0x81 /* _CST changed. */ 46 47 static int acpi_cpu_probe(device_t dev); 48 static int acpi_cpu_attach(device_t dev); 49 static struct resource_list * 50 acpi_cpu_get_rlist(device_t, device_t); 51 static struct resource * 52 acpi_cpu_alloc_resource(device_t, device_t, 53 int, int *, u_long, u_long, u_long, u_int, int); 54 static int acpi_cpu_release_resource(device_t, device_t, 55 int, int, struct resource *); 56 static struct ksensordev * 57 acpi_cpu_get_sensdev(device_t); 58 59 static int acpi_cpu_get_id(uint32_t, uint32_t *, uint32_t *); 60 static void acpi_cpu_notify(ACPI_HANDLE, UINT32, void *); 61 62 static device_method_t acpi_cpu_methods[] = { 63 /* Device interface */ 64 DEVMETHOD(device_probe, acpi_cpu_probe), 65 DEVMETHOD(device_attach, acpi_cpu_attach), 66 DEVMETHOD(device_detach, bus_generic_detach), 67 DEVMETHOD(device_shutdown, bus_generic_shutdown), 68 DEVMETHOD(device_suspend, bus_generic_suspend), 69 DEVMETHOD(device_resume, bus_generic_resume), 70 71 /* Bus interface */ 72 DEVMETHOD(bus_add_child, bus_generic_add_child), 73 DEVMETHOD(bus_print_child, bus_generic_print_child), 74 DEVMETHOD(bus_read_ivar, bus_generic_read_ivar), 75 DEVMETHOD(bus_write_ivar, bus_generic_write_ivar), 76 DEVMETHOD(bus_get_resource_list, acpi_cpu_get_rlist), 77 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource), 78 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource), 79 DEVMETHOD(bus_alloc_resource, acpi_cpu_alloc_resource), 80 DEVMETHOD(bus_release_resource, acpi_cpu_release_resource), 81 DEVMETHOD(bus_driver_added, bus_generic_driver_added), 82 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 83 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 84 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 85 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 86 87 /* CPU interface */ 88 DEVMETHOD(cpu_get_sensdev, acpi_cpu_get_sensdev), 89 90 DEVMETHOD_END 91 }; 92 93 static driver_t acpi_cpu_driver = { 94 "cpu", 95 acpi_cpu_methods, 96 sizeof(struct acpi_cpu_softc) 97 }; 98 99 static devclass_t acpi_cpu_devclass; 100 DRIVER_MODULE(cpu, acpi, acpi_cpu_driver, acpi_cpu_devclass, NULL, NULL); 101 MODULE_DEPEND(cpu, acpi, 1, 1, 1); 102 103 static int 104 acpi_cpu_probe(device_t dev) 105 { 106 int acpi_id, cpu_id; 107 ACPI_BUFFER buf; 108 ACPI_HANDLE handle; 109 ACPI_STATUS status; 110 ACPI_OBJECT *obj; 111 112 if (acpi_disabled("cpu") || acpi_get_type(dev) != ACPI_TYPE_PROCESSOR) 113 return ENXIO; 114 115 handle = acpi_get_handle(dev); 116 117 /* 118 * Get our Processor object. 119 */ 120 buf.Pointer = NULL; 121 buf.Length = ACPI_ALLOCATE_BUFFER; 122 status = AcpiEvaluateObject(handle, NULL, NULL, &buf); 123 if (ACPI_FAILURE(status)) { 124 device_printf(dev, "probe failed to get Processor obj - %s\n", 125 AcpiFormatException(status)); 126 return ENXIO; 127 } 128 129 obj = (ACPI_OBJECT *)buf.Pointer; 130 if (obj->Type != ACPI_TYPE_PROCESSOR) { 131 device_printf(dev, "Processor object has bad type %d\n", obj->Type); 132 AcpiOsFree(obj); 133 return ENXIO; 134 } 135 136 acpi_id = obj->Processor.ProcId; 137 AcpiOsFree(obj); 138 139 /* 140 * Find the processor associated with our unit. We could use the 141 * ProcId as a key, however, some boxes do not have the same values 142 * in their Processor object as the ProcId values in the MADT. 143 */ 144 if (acpi_cpu_get_id(device_get_unit(dev), &acpi_id, &cpu_id) != 0) 145 return ENXIO; 146 147 acpi_set_magic(dev, cpu_id); 148 device_set_desc(dev, "ACPI CPU"); 149 150 return 0; 151 } 152 153 static int 154 acpi_cpu_attach(device_t dev) 155 { 156 struct acpi_cpu_softc *sc = device_get_softc(dev); 157 ACPI_HANDLE handle; 158 device_t child; 159 int cpu_id, cpu_features; 160 struct acpi_softc *acpi_sc; 161 162 handle = acpi_get_handle(dev); 163 cpu_id = acpi_get_magic(dev); 164 165 acpi_sc = acpi_device_get_parent_softc(dev); 166 if (cpu_id == 0) { 167 sysctl_ctx_init(&sc->glob_sysctl_ctx); 168 sc->glob_sysctl_tree = SYSCTL_ADD_NODE(&sc->glob_sysctl_ctx, 169 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), 170 OID_AUTO, "cpu", CTLFLAG_RD, 0, 171 "node for CPU global settings"); 172 if (sc->glob_sysctl_tree == NULL) 173 return ENOMEM; 174 } 175 176 sysctl_ctx_init(&sc->pcpu_sysctl_ctx); 177 sc->pcpu_sysctl_tree = SYSCTL_ADD_NODE(&sc->pcpu_sysctl_ctx, 178 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), 179 OID_AUTO, device_get_nameunit(dev), CTLFLAG_RD, 0, 180 "node for per-CPU settings"); 181 if (sc->pcpu_sysctl_tree == NULL) { 182 sysctl_ctx_free(&sc->glob_sysctl_ctx); 183 return ENOMEM; 184 } 185 186 /* 187 * Before calling any CPU methods, collect child driver feature hints 188 * and notify ACPI of them. We support unified SMP power control 189 * so advertise this ourselves. Note this is not the same as independent 190 * SMP control where each CPU can have different settings. 191 */ 192 cpu_features = ACPI_PDC_MP_C1PXTX | ACPI_PDC_MP_C2C3; 193 cpu_features |= acpi_cpu_md_features(); 194 195 /* 196 * CPU capabilities are specified as a buffer of 32-bit integers: 197 * revision, count, and one or more capabilities. 198 */ 199 if (cpu_features) { 200 uint32_t cap_set[3]; 201 ACPI_STATUS status; 202 203 cap_set[0] = 0; 204 cap_set[1] = cpu_features; 205 status = acpi_eval_osc(dev, handle, 206 "4077A616-290C-47BE-9EBD-D87058713953", 1, cap_set, 2); 207 208 if (ACPI_FAILURE(status)) { 209 ACPI_OBJECT_LIST arglist; 210 ACPI_OBJECT arg[4]; 211 212 if (bootverbose) 213 device_printf(dev, "_OSC failed, using _PDC\n"); 214 215 arglist.Pointer = arg; 216 arglist.Count = 1; 217 arg[0].Type = ACPI_TYPE_BUFFER; 218 arg[0].Buffer.Length = sizeof(cap_set); 219 arg[0].Buffer.Pointer = (uint8_t *)cap_set; 220 cap_set[0] = 1; /* revision */ 221 cap_set[1] = 1; /* # of capabilities integers */ 222 cap_set[2] = cpu_features; 223 AcpiEvaluateObject(handle, "_PDC", &arglist, NULL); 224 } 225 } 226 227 ksnprintf(sc->cpu_sensdev.xname, sizeof(sc->cpu_sensdev.xname), "%s", 228 device_get_nameunit(dev)); 229 sensordev_install(&sc->cpu_sensdev); 230 231 child = BUS_ADD_CHILD(dev, dev, 0, "cpu_cst", -1); 232 if (child == NULL) 233 return ENXIO; 234 acpi_set_handle(child, handle); 235 acpi_set_magic(child, cpu_id); 236 sc->cpu_cst = child; 237 238 child = BUS_ADD_CHILD(dev, dev, 0, "cpu_pst", -1); 239 if (child == NULL) 240 return ENXIO; 241 acpi_set_handle(child, handle); 242 acpi_set_magic(child, cpu_id); 243 244 bus_generic_probe(dev); 245 bus_generic_attach(dev); 246 247 AcpiInstallNotifyHandler(handle, ACPI_DEVICE_NOTIFY, acpi_cpu_notify, sc); 248 249 return 0; 250 } 251 252 /* 253 * All resources are assigned directly to us by acpi, 254 * so 'child' is bypassed here. 255 */ 256 static struct resource_list * 257 acpi_cpu_get_rlist(device_t dev, device_t child __unused) 258 { 259 return BUS_GET_RESOURCE_LIST(device_get_parent(dev), dev); 260 } 261 262 static struct resource * 263 acpi_cpu_alloc_resource(device_t dev, device_t child __unused, 264 int type, int *rid, u_long start, u_long end, 265 u_long count, u_int flags, int cpuid) 266 { 267 return BUS_ALLOC_RESOURCE(device_get_parent(dev), dev, type, rid, 268 start, end, count, flags, cpuid); 269 } 270 271 static int 272 acpi_cpu_release_resource(device_t dev, device_t child __unused, 273 int type, int rid, struct resource *r) 274 { 275 return BUS_RELEASE_RESOURCE(device_get_parent(dev), dev, type, rid, r); 276 } 277 278 /* 279 * Find the nth present CPU and return its pc_cpuid as well as set the 280 * pc_acpi_id from the most reliable source. 281 */ 282 static int 283 acpi_cpu_get_id(uint32_t idx, uint32_t *acpi_id, uint32_t *cpu_id) 284 { 285 struct mdglobaldata *md; 286 uint32_t i; 287 288 KASSERT(acpi_id != NULL, ("Null acpi_id")); 289 KASSERT(cpu_id != NULL, ("Null cpu_id")); 290 for (i = 0; i < ncpus; i++) { 291 if (CPUMASK_TESTBIT(smp_active_mask, i) == 0) 292 continue; 293 md = (struct mdglobaldata *)globaldata_find(i); 294 KASSERT(md != NULL, ("no pcpu data for %d", i)); 295 if (idx-- == 0) { 296 /* 297 * If gd_acpi_id was not initialized (e.g., box w/o MADT) 298 * override it with the value from the ASL. Otherwise, if the 299 * two don't match, prefer the MADT-derived value. Finally, 300 * return the gd_cpuid to reference this processor. 301 */ 302 if (md->gd_acpi_id == 0xffffffff) { 303 kprintf("cpu%d: acpi id was not set, set it to %u\n", 304 i, *acpi_id); 305 md->gd_acpi_id = *acpi_id; 306 } else if (md->gd_acpi_id != *acpi_id) { 307 kprintf("cpu%d: acpi id mismatch, madt %u, " 308 "processor object %u\n", 309 i, md->gd_acpi_id, *acpi_id); 310 *acpi_id = md->gd_acpi_id; 311 } 312 *cpu_id = md->mi.gd_cpuid; 313 return 0; 314 } 315 } 316 return ESRCH; 317 } 318 319 static void 320 acpi_cpu_notify(ACPI_HANDLE handler __unused, UINT32 notify, void *xsc) 321 { 322 struct acpi_cpu_softc *sc = xsc; 323 324 switch (notify) { 325 case ACPI_NOTIFY_CX_STATES: 326 if (sc->cpu_cst_notify != NULL) 327 sc->cpu_cst_notify(sc->cpu_cst); 328 break; 329 } 330 } 331 332 static struct ksensordev * 333 acpi_cpu_get_sensdev(device_t dev) 334 { 335 struct acpi_cpu_softc *sc = device_get_softc(dev); 336 337 return &sc->cpu_sensdev; 338 } 339